CN113587264B - 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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- CN113587264B CN113587264B CN202010370228.5A CN202010370228A CN113587264B CN 113587264 B CN113587264 B CN 113587264B CN 202010370228 A CN202010370228 A CN 202010370228A CN 113587264 B CN113587264 B CN 113587264B
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a control method of coolant temperature, 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 air conditioner outdoor unit, the cooling pipeline comprises a plate heat exchanger provided with a first coolant flow path and a second coolant flow path, two ends of the first coolant flow path are respectively connected with the cooling pipeline and an indoor heat exchanger, one end of the second coolant 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 coolant 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 coolant 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 that the coolant temperature is reduced. The invention avoids the outdoor unit electric control device from stopping working because of poor heat dissipation effect and entering a high-temperature protection state, and avoids the outdoor unit electric control device from being in a fault state because of poor heat dissipation effect.
Description
Technical Field
The present invention relates to the field of air conditioners, and in particular, to a method for controlling a refrigerant temperature, a multi-split air conditioning system, and a readable storage medium.
Background
In order to make the outdoor unit electric control device in the air conditioner have a better heat dissipation effect, the prior multi-split air conditioning system often adopts a refrigerant heat dissipation technology. When the air conditioner heats and runs and the temperature of the indoor room of the air conditioner reaches the set temperature, the compressor of the air conditioner stops running; when the indoor room temperature is lower than the set temperature, the compressor is restarted, at the moment, the air conditioner unit is likely to be in a frequently started and stopped state, and in the process of frequently starting and stopping, the unit generates large heat of the outdoor unit electric control device due to large starting power of the compressor, and in addition, the unit executes cold air prevention operation in the starting stage, and meanwhile, the temperature of a cooling medium radiating the outdoor unit electric control device is higher, so that the outdoor unit electric control device is finally protected at a high temperature or in a fault state due to poor radiating effect.
Therefore, in the multi-split air conditioner system, the outdoor unit electric control device can enter a high-temperature protection state to stop working due to poor heat dissipation effect.
Disclosure of Invention
The invention mainly aims to provide a control method of refrigerant temperature, 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 can enter a high-temperature protection state to stop working due to poor heat dissipation effect in the existing multi-split air conditioner system.
In order to achieve the above object, the present invention provides a method for controlling a temperature of a refrigerant, the method for controlling a temperature of a refrigerant is applied to a multi-split air conditioning system, the multi-split air conditioning system includes a plate heat exchanger and a cooling pipeline, the cooling pipeline is used for cooling an electric control device of an outdoor unit of the 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 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 refrigerant temperature of the cooling path pipe;
detecting whether the temperature of the refrigerant is greater than or equal to a first preset temperature;
if the refrigerant temperature is detected to be greater than or equal to the first preset temperature, the opening degree of the throttling device is increased so as to reduce the refrigerant temperature.
Optionally, after the step of detecting whether the temperature of the refrigerant is greater than or equal to the first preset temperature, the method further includes:
if the refrigerant temperature is detected to be smaller than the first preset temperature, detecting whether the refrigerant temperature is larger than or equal to a second preset temperature, wherein the first preset temperature is larger than the second preset temperature;
and if the refrigerant temperature is detected to be greater than or equal to the second preset temperature, controlling the opening degree of the throttling device to be unchanged.
Optionally, after the step of detecting whether the refrigerant temperature is greater than or equal to the second preset temperature if the refrigerant temperature is detected to be less than the first preset temperature, the method further includes:
and if the refrigerant temperature is detected to be smaller 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 the second preset temperature if the refrigerant temperature is detected to be less than the first preset temperature, the method further includes:
acquiring the current relative humidity and the outdoor environment temperature of the multi-split air conditioning system;
and calculating to obtain a second preset temperature according to the ambient temperature and the relative humidity.
Optionally, if the refrigerant temperature is detected to be greater than or equal to the first preset temperature, the step of increasing the opening 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 of the throttling device according to the opening increasing step number so as to reduce the temperature of the refrigerant.
Optionally, after the step of increasing the opening of the throttling device by the opening increasing step number to reduce the temperature of the refrigerant, the method further includes:
re-acquiring the refrigerant temperature of the cooling path pipe after a preset time length;
and if the re-acquired refrigerant temperature 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 step number so as to reduce the refrigerant temperature.
Optionally, if the refrigerant temperature is detected to be greater than or equal to the first preset temperature, the step of increasing the opening 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 an opening increasing step number according to the temperature difference value, and increasing the opening of the throttling device according to the opening increasing step number so as to reduce the temperature of the refrigerant.
Optionally, the step of determining the opening degree increase step number according to the temperature difference value includes:
obtaining a mapping relation between a pre-stored refrigerant temperature, a first preset temperature corresponding difference value 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.
In addition, in order to achieve the above purpose, the invention also provides a multi-split air conditioning system, which 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 the 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 the indoor heat exchanger, one end of the second refrigerant flow path is communicated with the 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 refrigerant temperature control program which is stored in the memory and can run on the processor, wherein the refrigerant temperature control program is executed by the processor to realize the steps of a refrigerant temperature control method corresponding to a federal learning server.
In addition, in order to achieve the above object, the present invention also provides a computer readable storage medium, on which a control program of a refrigerant temperature is stored, the control program of the refrigerant temperature realizing the steps of the control method of the refrigerant temperature as described above when being executed by a processor.
In the invention, the multi-split air conditioning system comprises a plate heat exchanger and a cooling pipeline, wherein the cooling pipeline is used for cooling an outdoor electric control device of the air conditioner, a refrigerant flow path is arranged in the plate heat exchanger, one end of the refrigerant flow path is communicated with a pipeline between the indoor heat exchanger and the plate exchanger through a liquid taking pipe, and the other end of the 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, and the refrigerant temperature of the cooling pipeline is obtained when the multi-split air conditioning system is in a heating mode, whether the refrigerant temperature is greater than or equal to a first preset temperature 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 so as to reduce the refrigerant temperature. When the temperature of the refrigerant of the cooling pipeline is too high, the opening of the throttling device is increased to reduce the temperature of the refrigerant, the heat dissipation effect of the outdoor unit electric control device is improved, the outdoor unit electric control device is prevented from entering a high-temperature protection state to stop working due to poor heat dissipation effect, and the outdoor unit electric control device is prevented from being in a fault state due to poor heat dissipation effect, so that the successful operation of the outdoor unit electric control device in the multi-split air conditioning system is ensured.
Drawings
FIG. 1 is a schematic flow chart of a first embodiment of a refrigerant temperature control method according to 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 diagram of a hardware operating environment according to an embodiment of the present invention.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, fig. 1 is a schematic flow chart of a first embodiment of a refrigerant temperature control method according to the present invention.
The embodiments of the present invention provide embodiments of a method for controlling the 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 performed in a different sequence than that shown or described herein.
It should be noted that the control method of the refrigerant temperature of the invention 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 outdoor electric control device of the 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 throttle 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 can be seen from 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 the power of a 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 flow 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 can be temperature sensors or other devices capable of detecting temperature. The throttling device plays a role in throttling and reducing the pressure of the high-pressure refrigerant and regulates the flow 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. The gas-liquid separator 10 if the refrigerant is not completely evaporated in the evaporator, the refrigerant mixed with the gas and the liquid may first flow back into the gas-liquid separator, from which the gas is separated, and back to the compressor. And the liquid can be remained 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 a heating mode, the compressor 1 discharges high-temperature high-pressure gaseous refrigerant, flows into each indoor unit for heating through the four-way valve 2, the high-temperature gaseous refrigerant condenses and releases heat, then is collected into a total liquid pipe, flows into the outdoor unit, then flows into the second heat exchanger 8 and the outdoor unit electric control device 5, and then throttles through the throttling device 4, the refrigerant evaporates and absorbs heat in the first heat exchanger 3 of the outdoor unit, flows into the gas-liquid separator 10 through the four-way valve 2, and the separated gaseous refrigerant returns to the compressor 1 for compression, thereby completing the whole cycle.
And step S10, when the multi-split air conditioning system is in a heating mode, acquiring the refrigerant temperature of the cooling path pipe.
When the multi-split air conditioning system is in a heating mode, the multi-split air conditioning system obtains the temperature of the refrigerant of the cooling pipeline through the temperature detection module. It should be noted that the temperature detection module for obtaining the temperature of the refrigerant of the cooling circuit is the first temperature detection module in fig. 2, and as can be seen from fig. 2, the temperature detection module for obtaining the temperature of the refrigerant of the cooling circuit is disposed between the outdoor unit electric control device and the plate heat exchanger, that is, the temperature detection module for obtaining the temperature of the refrigerant of the cooling circuit is connected with the outdoor unit electric control device and the plate heat exchanger. The multi-split air conditioning system can acquire a current mode identifier, and whether the multi-split air conditioning system is in a heating mode or a cooling mode currently is determined through the mode identifier. In this embodiment, there are two mode identifiers, 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, and the embodiment does not limit the expression forms of the cooling identifier and the heating identifier, for example, the heating identifier and the cooling identifier can be represented in the forms of numbers and/or letters, etc. It can be appreciated 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 current mode is the heating mode; 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 current mode is in the refrigeration mode.
It should be noted that, the refrigerant temperature of the cooling circuit in the embodiment of the present invention does not have the function of air-supplementing and enthalpy-increasing, that is, the main control objective of the air-supplementing and enthalpy-increasing plate flow-exchanging path in the embodiment of the present invention is to control the temperature of the refrigerant passing through the outdoor unit electric control device, and the air-supplementing and enthalpy-increasing function cannot control the temperature of the refrigerant entering the outdoor unit electric control device when being started. The air supplementing and enthalpy increasing technology is that the compressor adopts a two-stage throttling middle air injection technology, and adopts a flash evaporator to perform gas-liquid separation, so that the enthalpy increasing effect is realized. As can be seen from fig. 2, compared with the conventional design of the flow path of the air-supplementing and enthalpy-increasing plate, the flow path of the air-supplementing and enthalpy-increasing plate in this embodiment does not need to be additionally provided with a branch circuit for controlling the refrigerant in the plate heat exchanger to flow into the compressor, and for the refrigerant flowing through the electric control device of the outdoor unit from the need, when the refrigerant passes through the plate heat exchanger, a throttling device is used for diverting a part of the refrigerant, at this time, the throttling device and the plate heat exchanger are in a parallel connection mode, and the refrigerant flowing through the throttling device and the plate heat exchanger can be converged and flow through the electric control device of the outdoor unit.
Step S20, detecting whether the temperature of the refrigerant is greater than or equal to a first preset temperature.
Step S30, if the refrigerant temperature is detected to be greater than or equal to the first preset temperature, increasing the opening of the throttling device so as to reduce the refrigerant temperature.
After the multi-split air conditioning system acquires 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 by the user through test. If the multi-split air conditioning system detects that the refrigerant temperature is greater than or equal to the first preset temperature, the multi-split air conditioning system increases the opening of the throttling device to reduce the refrigerant temperature, and at this time, the opening of the throttling device 7 connected to the second heat exchanger 8 in fig. 2 is increased, and in this embodiment, the controlled throttling device is the throttling device 7 in fig. 2. It can be understood that when the opening of the throttling device is increased, the refrigerant passing through the electric control device of the outdoor unit is increased, so that the temperature of the refrigerant in the cooling path pipe is reduced. In fig. 2, a refrigerant branch (broken line) formed by the plate heat exchanger and the throttle device is opposite to a refrigerant flow direction in a main refrigerant path (solid line), and the refrigerant enters the plate heat exchanger to exchange heat while passing through the throttle device.
Further, step S30 includes:
and a 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 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 the 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, for example, the opening increasing step number can be set to be 2, 3 or 5. After 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 steps of opening degree increase is B, the opening degree of the throttle device after opening degree increase 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 difference between the total opening degree and the current opening degree, and then obtain an opening increase step number according to the opening difference, for example, multiply the opening difference by a preset proportion to obtain the opening increase 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 smaller than 1, the multi-split air conditioning system determines that the opening increase step number is 1; if the product of the opening difference value and the preset proportion has decimal points, the multi-split air conditioning system adopts a rounding method, the opening increasing step number is determined according to the product, and if the product of the opening difference value and the preset proportion is 5.3, the opening increasing step number is determined to be 5.
Further, the control method of the refrigerant temperature further comprises the following steps:
and c, re-acquiring the refrigerant temperature of the cooling pipeline after the preset time.
And d, if the re-acquired refrigerant temperature is greater than or equal to the first preset temperature, increasing the opening of the throttling device according to the opening increasing step number again so as to reduce the refrigerant temperature.
Further, after the opening of the throttling device is increased, the multi-split air conditioning system acquires the refrigerant temperature of the cooling path through the temperature detection module again after the preset time period, and judges whether the re-acquired refrigerant temperature is greater than or equal to the first preset temperature. The preset duration can be set according to specific needs, and the size of the preset duration is not particularly limited in this embodiment. If the multi-split air conditioning system determines that the re-acquired refrigerant temperature 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 refrigerant temperature. It will be appreciated that, if the opening of the throttle device is a+b after the opening of the throttle device is increased for the first time, the opening of the throttle device is a+b+b after the opening of the throttle device is increased again by the number of opening increase steps. Further, if the re-acquired refrigerant temperature is determined to be smaller than the first preset temperature, the fact that the refrigerant temperature of the cooling pipeline is reduced is indicated, and at the moment, the multi-split air conditioning system does not increase the opening of the throttling device any more.
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 an opening increasing step number according to the temperature difference value, 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 the 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 between the temperature of the refrigerant and the first preset temperature. After the multi-split air conditioning system calculates a temperature difference between the temperature of the refrigerant and a first preset temperature, the multi-split air conditioning system determines an 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 so as to reduce the temperature of the refrigerant. It will be appreciated that as the temperature difference increases, the corresponding number of opening steps increases.
Further, the control method of the refrigerant temperature further comprises the following steps:
step g, obtaining a mapping relation between a pre-stored difference value corresponding to the 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 step number according to the temperature difference between the refrigerant temperature and the first preset temperature, the multi-split air conditioning system obtains a mapping relation between a pre-stored refrigerant temperature, a pre-stored difference corresponding to the first preset temperature and the opening increasing step number, and determines the opening increasing step number according to the mapping relation and the calculated temperature difference. The mapping relationship may be set according to specific needs, and in the mapping relationship, one difference value may correspond to one opening increase step number, or a plurality of difference values may correspond to one opening increase step number.
Further, in this 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 as to avoid condensation of the refrigerant due to contact with the outside air.
According to the embodiment, when the multi-split air conditioning system is in the heating mode, the refrigerant temperature of the cooling pipeline is obtained, whether the refrigerant temperature is larger than or equal to the first preset temperature is detected, and if the refrigerant temperature is larger than or equal to the first preset temperature, the opening degree of the throttling device is increased so as to reduce the refrigerant temperature. When the temperature of the refrigerant of the cooling pipeline is too high, the opening of the throttling device is increased to reduce the temperature of the refrigerant, the heat dissipation effect of the outdoor unit electric control device is improved, the outdoor unit electric control device is prevented from entering a high-temperature protection state to stop working due to poor heat dissipation effect, and the outdoor unit electric control device is prevented from being in a fault state due to poor heat dissipation effect, so that the successful operation of the outdoor unit electric control device in the multi-split air conditioning system is ensured.
Further, a second embodiment of the refrigerant temperature control method of the present invention is provided. The difference between the second embodiment of the refrigerant temperature control method and the first embodiment of the refrigerant temperature control method is that the refrigerant temperature control method further includes:
and h, if the refrigerant temperature is detected to be smaller than the first preset temperature, detecting whether the refrigerant temperature is larger than or equal to a second preset temperature, wherein the first preset temperature is larger than the second preset temperature.
And i, if the refrigerant temperature 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 refrigerant temperature is smaller than the first preset temperature, the multi-split air conditioning system detects whether the refrigerant temperature is larger than or equal to the second preset temperature, wherein the first preset temperature is larger than the second preset temperature, the second preset temperature can be set according to specific requirements, and the size of the second preset temperature is not limited in the embodiment. 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 degree of the throttling device to be unchanged, so that the temperature of the refrigerant is controlled to be kept in a reasonable range through controlling the opening degree of the throttling device to be unchanged, the phenomenon that the outdoor electric control device enters a high-temperature protection state to stop working and is in a fault state is avoided, and the phenomenon that the temperature of the refrigerant is too low and water condensation is caused is avoided.
Further, the control method of the refrigerant temperature further comprises the following steps:
and j, acquiring the current relative humidity and the outdoor environment temperature of the multi-split air conditioning system.
And k, calculating to obtain a second preset temperature according to the ambient temperature and the relative humidity.
Further, the multi-split air conditioning system acquires 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 possibly reached at the same temperature, and can also be expressed as the ratio of the partial pressure of the water vapor in the humid air to the saturated pressure of the water at the same temperature. Specifically, in the multi-split air conditioning system, a humidity sensor is provided, and the relative humidity can be obtained through the humidity sensor. The multi-split air conditioning system obtains outdoor environment temperature, and particularly, the multi-split air conditioning system can obtain the outdoor environment temperature through a temperature sensor. And after the multi-split air conditioning system acquires the ambient temperature and the relative humidity, the multi-split air conditioning system calculates a second preset temperature according to the ambient temperature and the relative humidity. Specifically, if the second preset temperature is denoted as T dp The formula of the second preset temperature calculated by the multi-split air conditioning system according to the ambient temperature and the relative humidity can be expressed as follows:
wherein H1 represents relative humidity, t=t1+273.15, T1 represents ambient temperature, T1 is in degrees celsius, c 8 ＝-5800.2206，c 9 ＝1.3914993，c 10 ＝-0.04860239，c 11 ＝0.41764768×10 -4 ，c 12 ＝-0.14452093×10 -7 ，c 13 = 6.5459673. It is understood that at this time, the second preset temperature is a dew point temperature.
According to the embodiment, when the refrigerant temperature is detected to be smaller than the first preset temperature, whether the refrigerant temperature is larger than or equal to the second preset temperature is further detected, if the refrigerant temperature is detected to be larger than or equal to the second preset temperature, the opening degree of the throttling device is controlled to be unchanged, so that the refrigerant temperature is controlled to be kept in a reasonable range by controlling the opening degree of the throttling device to be unchanged, the outdoor unit electric control device is prevented from entering 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 prevented from being too low, and the condensation phenomenon is avoided, so that 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 refrigerant temperature control method of the present invention is provided. The difference between the third embodiment of the refrigerant temperature control method and the second embodiment of the refrigerant temperature control method is that the refrigerant temperature control method further includes:
and step l, if the refrigerant temperature is detected to be smaller than the second preset temperature, closing the throttling device.
If the multi-split air conditioning system detects that the temperature of the refrigerant is smaller than the second preset temperature, the multi-split air conditioning system closes the throttling device, so that the phenomenon of 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 burnt out, namely the phenomenon of condensation caused by too low temperature of the refrigerant of the outdoor unit electric control device corresponding to the cooling pipeline is avoided. Further, after the throttle 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 mobile terminal. After receiving the prompt information, the mobile terminal outputs the prompt information to prompt the user that the throttling device in the multi-split air conditioning system is closed through the prompt information, so that the mobile terminal user can know the reason that the multi-split air conditioning system stops working in time. In this embodiment, the output mode of the prompt information output by the multi-split air conditioning system and the mobile terminal is not limited.
According to the embodiment of the invention, when the temperature of the refrigerant is detected to be smaller than the second preset temperature, the throttling device is closed, so that the phenomenon of 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 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 running 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 can be terminal equipment such as a PC and a portable computer.
As shown in fig. 3, the multi-split air conditioning system may include: a processor 1001, such as a MCU or microprocessor, a memory 1005, a user interface 1003, a network interface 1004, a communication bus 1002. Wherein the communication bus 1002 is used to enable connected communication between these components. The user interface 1003 may include a Display, an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may further 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 stable memory (non-volatile memory), such as a disk memory. The memory 1005 may also optionally be a storage device separate from the processor 1001 described above.
It will be appreciated by those skilled in the art that the multi-split air conditioning system configuration shown in fig. 3 is not limiting of the multi-split air conditioning system and may include more or fewer components than shown, or certain components may be combined, or a different arrangement of components.
As shown in fig. 3, the memory 1005, which is a type of computer storage medium, may include an operating system, a network communication module, a user interface module, and a refrigerant temperature control program. The operating system is a program for managing and controlling hardware and software resources of the multi-split air conditioning system, and supports the operation of control programs of the temperature of the refrigerant and 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 a mobile terminal, and performing data communication with the mobile terminal, for example, sending a prompt message to the mobile terminal; the network interface 1004 is mainly used for a background server and is in 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 refrigerant temperature control method as described above.
The specific implementation manner of the multi-split air conditioning system is basically the same as that of each embodiment of the refrigerant temperature control method, and is not repeated here.
In addition, the embodiment of the invention also provides a computer readable storage medium, wherein the computer readable storage medium stores a control program of the temperature of the refrigerant, and the control program of the temperature of the refrigerant realizes the following steps when being executed by a processor:
when the multi-split air conditioning system is in a heating mode, acquiring the refrigerant temperature of the cooling path pipe;
detecting whether the temperature of the refrigerant is greater than or equal to a first preset temperature;
if the refrigerant temperature is detected to be greater than or equal to the first preset temperature, the opening degree of the throttling device is increased so as to reduce the refrigerant temperature.
Further, after the step of detecting whether the temperature of the refrigerant is greater than or equal to the first preset temperature, when the control program of the temperature of the refrigerant is executed by the processor, the following steps are further executed:
if the refrigerant temperature is detected to be smaller than the first preset temperature, detecting whether the refrigerant temperature is larger than or equal to a second preset temperature, wherein the first preset temperature is larger than the second preset temperature;
and if the refrigerant temperature is detected to be greater than or equal to the second preset temperature, controlling the opening degree of the throttling device to be unchanged.
Further, after the step of detecting whether the refrigerant temperature is greater than or equal to the second preset temperature if the refrigerant temperature is detected to be less than the first preset temperature, the following steps are further executed when the control program of the refrigerant temperature is executed by the processor:
and if the refrigerant temperature is detected to be smaller than the second preset temperature, closing the throttling device.
Further, if the refrigerant temperature is detected to be less than the first preset temperature, before the step of detecting whether the refrigerant temperature is greater than or equal to the second preset temperature, the following steps are further executed when the control program of the refrigerant temperature is executed by the processor:
acquiring the current relative humidity and the outdoor environment temperature of the multi-split air conditioning system;
and calculating to obtain a second preset temperature according to the ambient temperature and the relative humidity.
Further, if the refrigerant temperature is detected to be greater than or equal to the first preset temperature, the step of increasing the opening 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 of the throttling device according to the opening increasing step number so as to reduce the temperature of the refrigerant.
Further, after the step of increasing the opening of the throttle device by the number of opening increasing steps to reduce the temperature of the refrigerant, when the control program of the temperature of the refrigerant is executed by the processor, the following steps are further executed:
re-acquiring the refrigerant temperature of the cooling path pipe after a preset time length;
and if the re-acquired refrigerant temperature 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 step number so as to reduce the refrigerant temperature.
Further, if the refrigerant temperature is detected to be greater than or equal to the first preset temperature, the step of increasing the opening 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 an opening increasing step number according to the temperature difference value, 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, the step of determining the opening degree increase step number according to the temperature difference value includes:
and obtaining a mapping relation between a pre-stored refrigerant temperature and a first preset temperature corresponding difference value and an opening increasing step number, and determining the opening increasing step number according to the mapping relation and the calculated temperature difference value.
The specific embodiment of the computer readable storage medium of the present invention is basically the same as the embodiments of the control method of the refrigerant temperature, and will not be described herein.
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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising instructions for causing a terminal device (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method according to the embodiments of the present invention.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (10)
1. The control method of the refrigerant temperature is characterized in that the control method of the refrigerant temperature 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 cooling pipeline is used for cooling an electric control device of an outdoor unit of the 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 refrigerant branch formed by the plate heat exchanger and the throttling device has opposite flow directions with the refrigerant in the main refrigerant path where the cooling pipeline is located;
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 refrigerant temperature of the cooling pipeline, wherein a temperature detection module for acquiring the refrigerant temperature of the cooling pipeline is arranged between an outdoor machine electric control device and a plate heat exchanger;
detecting whether the temperature of the refrigerant is greater than or equal to a first preset temperature;
if the refrigerant temperature is detected to be greater than or equal to the first preset temperature, the opening degree of the throttling device is increased so as to reduce the refrigerant temperature.
2. The method of claim 1, wherein after the step of detecting whether the refrigerant temperature is greater than or equal to a first preset temperature, further comprising:
if the refrigerant temperature is detected to be smaller than the first preset temperature, detecting whether the refrigerant temperature is larger than or equal to a second preset temperature, wherein the first preset temperature is larger than the second preset temperature;
and if the refrigerant temperature is detected to be greater than or equal to the second preset temperature, controlling the opening degree of the throttling device to be unchanged.
3. The method according to claim 2, wherein 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, further comprising:
and if the refrigerant temperature is detected to be smaller than the second preset temperature, closing the throttling device.
4. The method according to claim 2, wherein 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, further comprising:
acquiring the current relative humidity and the outdoor environment temperature of the multi-split air conditioning system;
and calculating to obtain a second preset temperature according to the ambient temperature and the relative humidity.
5. The method according to any one of claims 1 to 4, wherein the step of increasing the opening degree of the throttle device to decrease the refrigerant temperature if the refrigerant temperature is detected to be 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 of the throttling device according to the opening increasing step number so as to reduce the temperature of the refrigerant.
6. The method of controlling a refrigerant temperature according to claim 5, wherein after the step of increasing the opening of the throttle device by the number of opening increasing steps to decrease the refrigerant temperature, further comprising:
re-acquiring the refrigerant temperature of the cooling pipeline after a preset time period;
and if the re-acquired refrigerant temperature 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 step number so as to reduce the refrigerant temperature.
7. The method according to any one of claims 1 to 4, wherein the step of increasing the opening degree of the throttle device to decrease the refrigerant temperature if the refrigerant temperature is detected to be 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 an opening increasing step number according to the temperature difference value, and increasing the opening of the throttling device according to the opening increasing step number so as to reduce the temperature of the refrigerant.
8. The method of controlling a temperature of a refrigerant according to claim 7, wherein the step of determining the opening degree increase step number according to the temperature difference value includes:
obtaining a mapping relation between a pre-stored refrigerant temperature, a first preset temperature corresponding difference value 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.
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 the 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 the 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 refrigerant temperature control program stored on the memory and capable of running on the processor, wherein the refrigerant temperature control program realizes the steps of the refrigerant temperature control method according to any one of claims 1 to 8 when being executed by the processor.
10. A computer-readable storage medium, wherein a control program for a refrigerant temperature is stored in the computer-readable storage medium, and the control program for a refrigerant temperature, when executed by a processor, implements the steps of the control method for a refrigerant temperature according to any one of claims 1 to 8.
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