CN106595004B - air conditioner control method and device and air conditioner - Google Patents
air conditioner control method and device and air conditioner Download PDFInfo
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- CN106595004B CN106595004B CN201710064228.0A CN201710064228A CN106595004B CN 106595004 B CN106595004 B CN 106595004B CN 201710064228 A CN201710064228 A CN 201710064228A CN 106595004 B CN106595004 B CN 106595004B
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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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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- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an air conditioner control method and device and an air conditioner, and belongs to the technical field of air conditioners. The control method comprises the following steps: acquiring an outdoor temperature threshold, a radiator temperature threshold and an air supply temperature condition; detecting the outdoor temperature of a space where an air conditioner is located; when the outdoor temperature is not greater than the outdoor temperature threshold value, detecting the temperature of the radiator within a set time length; and when the heat dissipation temperature is not greater than the temperature threshold of the radiator, adjusting the flow opening of the first throttling device to enable the heat dissipation temperature to reach the air supply temperature condition. The control method of the invention realizes the heat exchange and cooling of the electric control element by controlling the heat exchange between the electric control element and the gaseous refrigerant flowing through the radiator, and can also adjust the flow opening of the throttling device according to the preset air-supplementing temperature, so that the part of the refrigerant after heat exchange can meet the temperature requirement of the compressor for supplementing air and increasing enthalpy, and the integral performance of the air conditioner is improved.
Description
Technical Field
the invention relates to the technical field of air conditioners, in particular to a control method and device of an air conditioner and the air conditioner.
background
in the existing fixed-frequency or variable-frequency air conditioner products in the market, in the process of outdoor overhigh temperature in summer, the enthalpy value of a refrigerant compressed by a compressor cannot meet the enthalpy value requirement of heat exchange, so that the heat exchange efficiency of the refrigerant flowing into a condenser and the outdoor environment is reduced, and therefore the compressor needs to be subjected to air supplementing and enthalpy increasing operation; the existing air-supplying enthalpy-increasing method mostly adopts a mode of directly charging a refrigerant subjected to heat exchange in an outdoor unit condenser into a compressor, and the temperature of the refrigerant cannot meet the optimal air-supplying enthalpy-increasing temperature requirement.
disclosure of Invention
The embodiment of the invention provides an air conditioner control method and device and an air conditioner. The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.
According to a first aspect of the present invention, there is provided a control method of an air conditioner, the control method including: acquiring an outdoor temperature threshold, a radiator temperature threshold and air supply temperature conditions, wherein the air supply temperature conditions comprise radiator temperatures corresponding to refrigerants flowing back to a compressor when air supply temperature requirements are met; detecting the outdoor temperature of a space where an air conditioner is located; when the outdoor temperature is not greater than the outdoor temperature threshold value, detecting the temperature of the radiator within a set time length; and when the heat dissipation temperature is not greater than the temperature threshold of the radiator, adjusting the flow opening of the first throttling device to enable the heat dissipation temperature to reach the air supply temperature condition.
Further, the temperature condition for air supply comprises:
The T heat sink is Tao + C,
wherein, T radiator is radiator temperature, Tao is outdoor temperature, C is temperature adjusting parameter, and the value range is 3 ~ 6 ℃.
Further, the air supply temperature condition also comprises the exhaust temperature of the compressor corresponding to the refrigerant flowing back to the compressor when the air supply temperature requirement is met; the control method further comprises the following steps: detecting the exhaust temperature of the compressor; and adjusting the flow opening of the first throttling device according to the exhaust temperature and the exhaust temperature threshold value to enable the exhaust temperature to meet the air supplementing temperature condition.
Further, the control method further comprises: when the outdoor temperature is higher than the outdoor temperature threshold, starting a first throttling device to enable the temperature of the radiator to be not higher than the temperature threshold of the radiator; or when the temperature of the radiator is greater than the temperature threshold of the radiator, the first throttling device is started to enable the temperature of the radiator to be not greater than the temperature threshold of the radiator.
Further, the control method further comprises: acquiring real-time indoor temperature and target indoor temperature set by a user; and determining the flow opening degrees of the second throttling device and the third throttling device according to the temperature difference value between the real-time indoor temperature and the target indoor temperature and the flow opening degree of the first throttling device.
Furthermore, the value range of the outdoor temperature threshold is 38-48 ℃, and the value range of the radiator temperature threshold is 55-65 ℃.
According to a second aspect of the present invention, there is also provided a control device of an air conditioner, the control device including: the air supply temperature condition comprises a radiator temperature corresponding to a refrigerant flowing back to the compressor when the air supply temperature requirement is met; the air conditioner is used for acquiring the outdoor temperature of the space where the air conditioner is located, which is detected by the first sensor; and the radiator temperature of the radiator detected by the second sensor within a set time length; and the main control unit is used for adjusting the flow opening of the first throttling device when the heat dissipation temperature is not greater than the temperature threshold of the radiator so as to enable the temperature of the radiator to reach the air supply temperature condition.
further, the obtaining unit is used for obtaining the air supply temperature condition, and comprises:
The T heat sink is Tao + C,
wherein, T radiator is radiator temperature, Tao is outdoor temperature, C is temperature adjusting parameter, and the value range is 3 ~ 6 ℃.
Further, the air supply temperature condition also comprises the exhaust temperature of the compressor corresponding to the refrigerant flowing back to the compressor when the air supply temperature requirement is met; the acquisition unit is further configured to: acquiring the exhaust temperature of the compressor detected by the fourth sensor; the main control unit is used for: and adjusting the flow opening of the first throttling device according to the exhaust temperature and the exhaust temperature threshold value to enable the exhaust temperature to meet the air supplementing temperature condition.
further, the main control unit is further configured to: when the outdoor temperature is higher than the outdoor temperature threshold, starting a first throttling device to enable the temperature of the radiator to be not higher than the temperature threshold of the radiator; or when the temperature of the radiator is greater than the temperature threshold of the radiator, the first throttling device is started to enable the temperature of the radiator to be not greater than the temperature threshold of the radiator.
further, the obtaining unit is further configured to: acquiring real-time indoor temperature detected by a third sensor and target indoor temperature set by a user; the main control unit is also used for: and determining the flow opening degrees of the second throttling device and the third throttling device according to the temperature difference value between the real-time indoor temperature and the target indoor temperature and the flow opening degree of the first throttling device.
According to a third aspect of the present invention, there is provided an air conditioner comprising an indoor unit having a first heat exchanger, an outdoor unit having a second heat exchanger and an intermediate air make-up compressor, an electric control unit located in the outdoor unit, the first heat exchanger, the second heat exchanger and the intermediate air make-up compressor being communicated with each other through a first pipe and a second pipe for constituting a refrigerant circulation circuit, and a cooling unit having a flash tank, a first throttling device and a radiator for dissipating heat of the electric control unit, wherein the flash tank is connected to the first pipe, the radiator is communicated with the intermediate air make-up compressor and the flash tank through a cooling pipe, the first throttling device is disposed on the cooling pipe, the air conditioner has a second throttling device disposed on the first pipe between the second heat exchanger and the flash tank, and a third throttling device disposed on the first pipe between the first heat exchanger and the flash tank, the air conditioner is provided with a first sensor for detecting an outdoor temperature, a second sensor for detecting a radiator temperature, a third sensor for detecting an indoor temperature, and a fourth sensor for detecting an exhaust gas temperature.
the control method of the invention realizes the heat exchange and cooling of the electric control element by controlling the heat exchange between the electric control element and the gaseous refrigerant flowing through the radiator, and can also adjust the flow opening of the throttling device according to the preset air-supplementing temperature, so that the part of the refrigerant after heat exchange can meet the temperature requirement of the compressor for supplementing air and increasing enthalpy, and the integral performance of the air conditioner is improved.
it is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
the accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a first flowchart of a control method according to the present invention;
FIG. 2 is a second flowchart of the control method of the present invention;
FIG. 3 is a schematic view of the overall structure of the air conditioner of the present invention;
FIG. 4 is a pressure-enthalpy diagram of refrigerant circulation in the air conditioner according to the present invention;
fig. 5 is a temperature entropy diagram of refrigerant circulation in the air conditioner of the present invention.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. Embodiments may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed. Herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, 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, 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 or apparatus that comprises the element. The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. As for the methods, products and the like disclosed by the embodiments, the description is simple because the methods correspond to the method parts disclosed by the embodiments, and the related parts can be referred to the method parts for description.
as shown in fig. 1 and 2, the present invention provides a control method of an air conditioner, the control method including:
S101, an outdoor temperature threshold, a radiator temperature threshold and air supply temperature conditions are obtained, wherein the air supply temperature conditions comprise radiator temperatures corresponding to refrigerants flowing back to a compressor when air supply temperature requirements are met.
Because the electric control element is arranged in the outdoor unit and is influenced by the outdoor environment temperature and the self heat productivity, the set outdoor temperature threshold value of the invention is related to the safe working temperature of the electric control element, in the embodiment, the value of the outdoor temperature threshold value is 40 ℃, namely 40 ℃ is taken as the temperature threshold value for judging whether the electric control element can safely operate; the upper limit of the temperature selection of the temperature threshold of the radiator is determined according to the safe working temperature of the electric control element, so that the temperature of the radiator exchanging heat with the electric control element is not higher than the safe working temperature of the electric control element, and the temperature of the electric control element is further ensured to be not higher than the safe working temperature of the electric control element.
Because the refrigerant flowing through the cooling pipeline flows back to the compressor for air supplement and enthalpy increase, the temperature of the radiator is required to reach the air supplement temperature condition while the first throttling device is adjusted to control the air supplement temperature of the refrigerant, so that the problems that the temperature of the radiator is increased and the temperature of an electric control element is reduced due to the fact that the opening degree of the first throttling device is too small are solved.
s102, detecting the outdoor temperature of a space where the air conditioner is located, wherein in the embodiment, the outdoor temperature is detected by a first sensor arranged on an outdoor unit;
s103, when the outdoor temperature is not greater than the outdoor temperature threshold value, detecting the temperature of the radiator within a set time length;
in an embodiment, the outdoor temperature is detected by a second sensor disposed on the radiator, and the set time length can be determined according to actual detection needs, for example, 3 minutes, 5 minutes, and the like, so as to reduce the interference effect caused by transient temperature change or short-time temperature change;
And S104, when the heat dissipation temperature is not greater than the temperature threshold of the radiator, adjusting the flow opening of the first throttling device to enable the temperature of the radiator to reach the air supply temperature condition.
In an embodiment, after the first throttling device is started, the refrigerant flows along the cooling pipeline and exchanges heat with the electric control element in the radiator, so that the temperature of the electric control element can be reduced, the actual temperature condition of the electric control element can be reflected by the temperature of the radiator detected by the second sensor, and when the temperature of the radiator is not greater than the temperature threshold of the radiator, the temperature of the electric control element is also within the temperature range of safe operation. Meanwhile, in the step S104, when the outdoor temperature is not greater than the outdoor temperature threshold, the heat exchange amount between the outdoor unit and the outdoor environment is less affected by the outdoor temperature, and in order to further improve the heat exchange amount between the second heat exchanger of the outdoor unit and the external environment, the control method of the present invention conveys the refrigerant flowing through the cooling pipeline into the compressor to supplement air and increase enthalpy, and improves the compression ratio of the compressor to the refrigerant, so that the refrigerant in the heat exchanger of the outdoor unit can meet the temperature and enthalpy requirements of heat exchange, the heat exchange efficiency between the heat exchanger of the outdoor unit and the outdoor environment is enhanced, and the use performance of the complete air conditioner is improved.
in one embodiment of the invention, the steps of the control method further comprise:
when the outdoor temperature is higher than the outdoor temperature threshold, the heat of the outdoor environment is conducted to the radiator and the electric control element through the outdoor unit, so that the temperature of the electric control element is increased, and therefore the first throttling device needs to be controlled to be started until the temperature of the radiator is not higher than the temperature threshold of the radiator.
for example, the flow opening of the first throttling device can be increased to increase the flow of the refrigerant flowing through the radiator, so as to realize cooling and heat dissipation of the electric control element; the flow opening degree of the first throttling device can also be determined according to the difference value between the outdoor temperature and the outdoor temperature threshold value, so that the refrigerant flow can meet the requirement of the heat dissipation refrigerant quantity.
In addition, when the temperature of the radiator is higher than the temperature threshold of the radiator, the first throttling device can be controlled to be started, and the heat exchange quantity of the radiator to the electric control element is increased, so that the temperature of the radiator is not higher than the temperature threshold of the radiator.
In some embodiments, the step of obtaining the temperature condition of the gas supply comprises: according to the outdoor temperature, determining air supply temperature conditions, wherein the air supply temperature conditions are as follows:
the T heat sink is Tao + C,
wherein, T radiator is radiator temperature, Tao is outdoor temperature, C is temperature adjusting parameter, and the value range is 3 ~ 6 ℃. In the air supply temperature condition obtained by the invention, the temperature of the radiator is higher than the outdoor temperature, so that the problem of surface condensation of the radiator caused by the fact that the temperature of the radiator is lower than the outdoor temperature can be reduced; meanwhile, the temperature of the radiator is also below the temperature threshold of the radiator, and the heat dissipation and cooling of the electric control element cannot be interfered.
optionally, the air supply temperature condition further includes an exhaust temperature of the compressor corresponding to the refrigerant flowing back to the compressor when the air supply temperature requirement is met; in order to make the discharge temperature of the compressor meet the temperature requirement of the refrigerant of the outdoor unit heat exchanger, the control method of the invention also comprises the following steps:
Detecting the exhaust temperature of the compressor, wherein in the embodiment, the exhaust temperature is detected by a fourth sensor arranged at the exhaust port of the compressor;
And adjusting the flow opening of the first throttling device according to the exhaust temperature and the exhaust temperature threshold value to enable the exhaust temperature to meet the air supplementing temperature condition. For example, the purpose of increasing enthalpy by air supply of the compressor is to reduce the exhaust temperature, so the exhaust temperature threshold value obtained by the invention is a temperature upper limit value, and when the exhaust temperature of the compressor is lower than the temperature upper limit value, the temperature of a refrigerant can meet the heat exchange requirement of an outdoor unit heat exchanger; therefore, the invention enables the temperature of the radiator and the exhaust temperature to meet the corresponding air supply temperature condition by adjusting the flow opening of the first throttling device, thereby improving the operating efficiency of the air conditioner.
in one embodiment of the present invention, the control method further includes:
acquiring real-time indoor temperature and target indoor temperature set by a user;
In the embodiment, the real-time indoor temperature is detected by a third sensor arranged on an indoor unit of a facility air conditioner; the target indoor temperature is set by a user through a remote controller or a display panel to operate the indoor unit of the air conditioner;
And determining the flow opening degrees of the second throttling device and the third throttling device according to the temperature difference value between the real-time indoor temperature and the target indoor temperature and the flow opening degree of the first throttling device.
In the embodiment, the first throttling device can be regarded as being connected with the first pipeline where the third throttling device is located in parallel, so that the flow of the refrigerant flowing through the second throttling device is the sum of the flow of the refrigerant flowing through the first throttling device and the flow of the refrigerant flowing through the third throttling device, the flow of the refrigerant needing to flow to the first heat exchanger of the indoor unit can be determined according to the temperature difference between the real-time indoor temperature and the target indoor temperature, and the flow of the refrigerant is matched with the flow opening degree of the third throttling device; and then, the refrigerant flow of the second throttling device can be obtained by adding the refrigerant flow of the first throttling device and the refrigerant flow of the third throttling device, and the flow opening degree of the second throttling device is determined according to the refrigerant flow of the second throttling device.
In an embodiment of the present invention, the value range of the outdoor temperature threshold is 38-48 ℃, and the specific value of the outdoor temperature threshold can be predetermined according to the area, climate, season, etc. where the air-conditioning user is located.
In one embodiment of the invention, the value range of the radiator temperature threshold is 55-65 ℃, and the specific value of the radiator temperature threshold is determined according to the type and the material of the electric control element, the rated safe working temperature and other factors.
The invention also provides a control device of the air conditioner, the control device adopts the control method disclosed in the above embodiment to carry out heat dissipation and cooling control on the electric control element of the air conditioner, and the control device comprises:
The air supply temperature condition comprises a radiator temperature corresponding to a refrigerant flowing back to the compressor when the air supply temperature requirement is met; and
The air conditioner is used for acquiring the outdoor temperature of the space where the air conditioner is located, which is detected by the first sensor; and the radiator temperature of the radiator detected by the second sensor within a set time length;
And the main control unit is used for adjusting the flow opening of the first throttling device when the heat dissipation temperature is not greater than the temperature threshold of the radiator so as to enable the radiator to reach the air supply temperature condition.
In some embodiments, the obtaining unit is configured to obtain the temperature condition of the gas supply, including: according to the outdoor temperature, determining air supply temperature conditions, wherein the air supply temperature conditions are as follows:
The T heat sink is Tao + C,
wherein, T radiator is radiator temperature, Tao is outdoor temperature, C is temperature adjusting parameter, and the value range is 3 ~ 6 ℃.
in some embodiments, the air supply temperature condition further includes an exhaust temperature of the compressor corresponding to the refrigerant flowing back to the compressor when the air supply temperature requirement is met; the acquisition unit is further configured to: acquiring the exhaust temperature of the compressor detected by the fourth sensor; the main control unit is used for: and adjusting the flow opening of the first throttling device according to the exhaust temperature and the exhaust temperature threshold value to enable the exhaust temperature to meet the air supplementing temperature condition.
In some embodiments, the master control unit is further to: and when the outdoor temperature is higher than the outdoor temperature threshold, controlling to start the first throttling device until the temperature of the radiator is not higher than the radiator temperature threshold.
in some embodiments, the obtaining unit is further configured to: acquiring real-time indoor temperature detected by a third sensor and target indoor temperature set by a user; the main control unit is also used for: and determining the flow opening degrees of the second throttling device and the third throttling device according to the temperature difference value between the real-time indoor temperature and the target indoor temperature and the flow opening degree of the first throttling device.
The air conditioner structure applied by the control method and the control device in the above embodiment is shown in fig. 3, the air conditioner includes an indoor unit and an outdoor unit, wherein the indoor unit includes a first heat exchanger 1 for exchanging heat with an indoor environment, the outdoor unit includes a second heat exchanger 2 for exchanging heat with the outdoor environment, a compressor 3 for providing circulating power for a refrigerant, electrical components such as a computer board and a single chip are disposed in the outdoor unit, the first heat exchanger 1, the second heat exchanger 2 and the compressor 3 are communicated through a first pipeline 4 and a second pipeline 5 for forming a conventional refrigerant circulation loop, in the embodiment, when the air conditioner operates in a cooling mode in summer, the refrigerant exchanging heat with the outdoor environment flows out of the second heat exchanger 2, flows into the first heat exchanger 1 through the first pipeline 4, and simultaneously, the refrigerant exchanging heat with the indoor environment flows out of the first heat exchanger 1, flows into the second heat exchanger 2 through the second pipeline 5, through the refrigerant circulation process, the refrigeration and cooling functions of the air conditioner on the indoor environment can be realized. Similarly, when the heating mode is operated in winter, the refrigerant flows between the first heat exchanger 1 and the second heat exchanger 2 in the direction opposite to the cooling mode. The heating and warming functions of the air conditioner to the indoor environment can be realized.
Besides the conventional refrigerant circulation loop, the air conditioner of the invention also comprises a cooling pipe group for solving the problem of overhigh temperature when an electric control component works.
Specifically, the cooling tube group mainly includes two parts of a cooling assembly and a cooling pipeline 9, wherein the cooling assembly mainly includes:
The flash evaporator 6 is connected to the first pipeline 4, can evaporate part of liquid refrigerants flowing through the first pipeline 4 into gaseous refrigerants and conveys the gaseous refrigerants to the cooling pipeline 9, so that the gaseous refrigerants are used as heat exchange media in the subsequent cooling process of the cooling pipeline 9;
the first throttling device 801 is arranged on the first pipeline 4 and is used for adjusting the flow of the gaseous refrigerant in the cooling pipeline 9, the pressure, the temperature and the like of the refrigerant subjected to heat exchange by the electric control part, so that the refrigerant flowing into the compressor 3 can meet the requirement of the compressor 3 for air supplement and enthalpy increase;
Radiator 7, radiator 7 connect on cooling line 9 and adjacent electric control spare set up, because electric control spare sets up in semi-closed container such as automatically controlled box mostly, consequently radiator 7 can be as gaseous refrigerant and the heat transfer carrier of electric control spare surrounding air, through cooling to electric control component's surrounding air, and then can be with the temperature control of electric control spare self below safe operating temperature. The specific structure and type of the radiator 7 can be determined according to the structure of the outdoor unit, and in the embodiment, the type of the radiator 7 arranged on the cooling pipeline 9 is a advection heat exchanger, and the advection heat exchanger has the advantages of high heat exchange rate, small occupied space and the like, and is suitable for the structure of the air-conditioning outdoor unit with a compact structure.
the flow sequence of the refrigerant used for dissipating heat and reducing temperature of the electric control part in the cooling pipe group is as follows: first line 4 → flash tank 6 → radiator 7 → compressor 3, and first throttle device 801 may be provided on cooling line 9 between flash tank 6 and compressor 3 as required.
In the air-supplying enthalpy-increasing structure of the conventional air conditioner, the refrigerant in the refrigerant pipeline is mostly directly conveyed to the compressor 3, in the process, parameters such as the temperature, the pressure and the like of the refrigerant do not change greatly, in the air conditioner of the present invention, the temperature of the gaseous refrigerant flowing through the radiator 7 is raised and the pressure thereof is increased, thereby reducing the subsequent compression efficiency of the refrigerant by the compressor 3, in one embodiment of the present invention, the air conditioner further includes a second throttling means 802 and a third throttling means 803, wherein, the second throttling set 802 is arranged on the first pipeline 4 between the second heat exchanger 2 and the flash evaporator 6, and the third throttling set 803 is arranged on the first pipeline 4 between the first heat exchanger 1 and the flash evaporator 6, compared with the conventional air-conditioning structure for supplementing air and increasing enthalpy, the air-conditioning has the advantages that the second throttling set 802 and the third throttling set 803 are arranged on the air-conditioning structure: taking the air-conditioning operation refrigeration mode as an example, before the liquid refrigerant flows into the flash evaporator 6 from the second heat exchanger 2 of the outdoor unit, the second throttling device 802 arranged between the second heat exchanger 2 and the flash evaporator 6 can throttle the refrigerant in one step to reduce the pressure of the refrigerant, so that the flash evaporator 6 can evaporate the liquid refrigerant into a gaseous refrigerant, and meanwhile, the temperature of the refrigerant is lower, so that the heat exchange amount of the refrigerant at the heat radiator 7 can be increased.
Because part of the liquid refrigerant flows into the cooling pipeline 9 in the form of gaseous refrigerant in the flash evaporator 6, in order to ensure that the temperature and the pressure of the refrigerant flowing into the first heat exchanger 1 of the indoor unit meet the actual indoor heat exchange requirements, the third throttling device 803 arranged between the first heat exchanger 1 and the flash evaporator 6 can play a role of a throttling expansion valve, and is used for adjusting the parameters of the temperature, the pressure and the like of the refrigerant flowing out of the flash evaporator 6.
The above embodiment is taken as an example of the air conditioner operating in the cooling mode under the high temperature working condition in summer, and similarly, under the low temperature working condition in winter, the outdoor low temperature condition may affect the heat exchange amount between the outdoor unit and the outdoor environment, and in order to ensure the heating amount when the air conditioner operates in the heating mode, the air supplying and enthalpy increasing operation needs to be performed on the compressor 3, when the air conditioner operates in a heating mode, the flow direction of the refrigerant in the air conditioner pipeline is opposite to that of the cooling mode, at the moment, the third throttling device 803 arranged between the first heat exchanger 1 and the flash tank 6 can play a throttling role of the second throttling device 802 under the cooling working condition, parameters such as the temperature, the pressure and the like of the refrigerant flowing into the flash tank 6 are firstly regulated in one step, the second throttling means 802 functions as a stop expansion valve for adjusting parameters such as temperature and pressure of the refrigerant flowing out of the flash tank 6 and flowing into the second heat exchanger 2 of the outdoor unit. In order to realize the refrigerant adjusting process under the two working conditions, the second throttling device 802 and the third throttling device 803 adopted by the invention are bidirectional throttling devices.
the outdoor unit of the air conditioner further comprises a gas-liquid separator 10 used for storing and conveying a refrigerant to the compressor 3, the compressor 3 at least comprises a first-stage compression part and a second-stage compression part, a mixing part is connected between the first-stage compression part and the second-stage compression part, wherein the first-stage compression part is used for performing first-stage compression on the refrigerant flowing into the gas-liquid separator 10, the mixing part is used for mixing the refrigerant flowing into the cooling pipeline 9 and the refrigerant subjected to first-stage compression, the second-stage compression part is used for performing second-stage compression on the mixed refrigerant, and the refrigerant output by the compressor 3 can meet the temperature and pressure required by the second heat exchanger 2 of the outdoor.
meanwhile, the return air port of the compressor 3 includes a first return air port communicating the first-stage compression portion and the gas-liquid separator 10, and a second return air port communicating the mixing portion and the radiator 7, so that the refrigerants in different refrigerant flow pipelines flow into the internal structure of the corresponding compressor 3.
Optionally, the compressor 3 of the present invention adopts the existing intermediate air make-up compressor 3, the mixing portion is an intermediate air make-up chamber of the intermediate air make-up compressor 3, and the second return air port is an air make-up port of the intermediate air make-up compressor 3.
in one embodiment of the present invention, the flash evaporator 6 is connected in series with the first pipeline 4, and the main structure of the flash evaporator 6 includes a liquid refrigerant portion and a gaseous refrigerant portion communicated with the liquid refrigerant portion, wherein the liquid refrigerant portion has a liquid inlet and a liquid outlet connected in series with the first pipeline 4, and a first gas outlet for the gaseous refrigerant to flow to the gaseous refrigerant portion, and the gaseous refrigerant portion also has a second gas outlet communicated with the cooling pipeline 9.
Correspondingly, the radiator 7 has an inlet end communicating with the second outlet of the gaseous refrigerant portion, and an outlet end communicating with the second return air port of the compressor 3.
In another embodiment of the present invention, the flash tank 6 is connected in parallel with the first pipeline 4, a stop valve is disposed on a parallel pipeline section of the first pipeline 4 corresponding to the flash tank 6, and the opening or closing of the first throttling device 801 and the stop valve can be controlled to conduct or block a refrigerant pipeline where the flash tank 6 is located and the corresponding parallel pipeline section, for example, the stop valve of the parallel pipeline section can be opened and the first throttling device 801 can be closed to prevent refrigerant from flowing through the cooling pipeline 9, which is suitable for a situation where the electric control part has a small heat generation amount and the temperature is kept below the safe working temperature, and is also suitable for a working condition where the compressor 3 does not need to supplement air and increase enthalpy.
meanwhile, for the parallel connection form of the flash evaporators 6, the refrigerant quantity flowing into the indoor unit first heat exchanger 1 and the refrigerant quantity for heat dissipation of the electric control or air supplement and enthalpy increase of the compressor 3 can be adjusted by controlling the flow opening of the first throttling device 801 and the stop valve, so that the whole air conditioner is maintained in the optimal working state.
Optionally, the first throttling device 801 in the cooling assembly is disposed on the cooling pipeline 9 between the heat sink 7 and the compressor 3, so as to adjust the flow rate and flow rate of the refrigerant in the cooling pipeline 9, and also play a role of an expansion valve, so as to perform secondary throttling on the gaseous refrigerant, so as to reduce the temperature and pressure of the refrigerant, and thus improve the compression efficiency of the compressor 3 on the mixed refrigerant.
In an embodiment of the present invention, the air conditioner is provided with a first sensor for detecting an indoor temperature, and the opening degrees of the first throttling device 801 and the second throttling device 802 can be adjusted according to the detected indoor temperature, so as to meet the refrigerant quantity requirement for heat exchange of an indoor environment.
as shown in fig. 4 and 5, taking the cooling mode as an example, the change process of the enthalpy value and the entropy value of the refrigerant in the circulation flow process of the air conditioner is as follows: the refrigerant at the state point a flows into the compressor 3 from the first return port, flows into the mixing portion after being compressed to the state point B at the primary compression portion, meanwhile, the refrigerant in the cooling pipeline 9 is isenthalpically throttled by the first throttling device 801 to be at the state point K, flows into the mixing portion of the compressor 3 from the second return port of the compressor 3, is mixed with the refrigerant at the state point B to be changed into the refrigerant at the state point C, and is subjected to secondary compression continuously by the secondary compression portion of the compressor 3 to be isentropically compressed into the refrigerant at the state point D; the compressor 3 inputs the refrigerant at the state point D into the second heat exchanger 2, and the refrigerant is cooled to a liquid point E by the outdoor environment; the refrigerant enters the first pipeline 4 along the outlet of the second heat exchanger 2, is subjected to isenthalpic throttling to a state point F through a second throttling device 802, and then flows into the flash tank 6; the refrigerant flowing out of a liquid outlet of a liquid refrigerant part of the flash evaporator 6 is at a state point G, is throttled to a state point I by a third flow device, enters the first heat exchanger 1 to absorb heat and evaporate, then is changed into a state point L, and then returns to the gas-liquid separator 10 through a second pipeline 5; meanwhile, the gaseous refrigerant flowing out of the second gas outlet of the gaseous refrigerant part of the flash tank 6 is at a state point H, and is changed into a state point J after passing through the parallel flow heat exchanger and exchanging heat with the electric control part, and then the refrigerant is subjected to pressure reduction and temperature reduction through the first throttling device 801 to be changed into a state point K, and flows into the mixing part of the compressor 3 again through the second gas return port of the compressor 3.
In the refrigerant cycle of the present invention, in order to reduce the mutual interference effect between the two processes of temperature reduction of the electric control component and gas and enthalpy increase of the compressor 3, the two processes can be implemented by controlling the flow opening degrees of the first throttling device 801, the second throttling device 802 and the third throttling device 803, for example, in the illustrated embodiment, after the refrigerant flowing out of the second heat exchanger 2 of the outdoor unit is throttled by the second throttling device 802, the refrigerant changes from the state point E to the state point F, the process is isenthalpic throttling, the enthalpy value of the refrigerant is unchanged, the pressure is reduced, the entropy value is increased, and the temperature is reduced; the refrigerant flowing through the first throttling device 801 is changed from a state point J to a state point K, the process is isenthalpic throttling, the enthalpy value of the refrigerant is unchanged, the pressure is reduced, the entropy value is increased, the temperature is reduced, and the efficiency of the compressor 3 for carrying out secondary compression on the mixed refrigerant is improved; the refrigerant flowing from the flash tank 6 to the third throttling device 803 is changed from the state point G to the state point I, the process is isenthalpic throttling, the enthalpy value of the refrigerant is unchanged, the pressure is reduced, the entropy value is increased, and the temperature is reduced, so that the refrigeration and heat exchange between the refrigerant and the indoor environment after the refrigerant enters the first heat exchanger 1 of the indoor unit are improved.
In an embodiment of the present invention, the air conditioner is provided with a first sensor for detecting an outdoor temperature, a second sensor for detecting an indoor temperature, a third sensor for detecting a radiator temperature, and a fourth sensor for detecting an exhaust temperature, and the first throttling device 801, the second throttling device 802, and the third throttling device 803 may be adjusted according to detected relevant temperature parameters, so that the air conditioner increases or decreases a flow rate of a refrigerant for radiating heat to the electric control component without affecting indoor heat exchange efficiency.
It is to be understood that the present invention is not limited to the procedures and structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (12)
1. the control method of the air conditioner is characterized in that the air conditioner comprises an indoor unit with a first heat exchanger, an outdoor unit with a second heat exchanger and an intermediate air supply compressor, an electric control is arranged in the outdoor unit, the first heat exchanger, the second heat exchanger and the intermediate air supply compressor are communicated through a first pipeline and a second pipeline and used for forming a refrigerant circulation loop, the air conditioner further comprises a cooling assembly, the cooling assembly is provided with a flash evaporator, a first throttling device and a radiator used for dissipating heat of the electric control piece, the flash evaporator is connected to the first pipeline, the radiator is respectively communicated with the intermediate air supply compressor and the flash evaporator through a cooling pipeline, the first throttling device is arranged on the cooling pipeline, and the air conditioner is provided with a second throttling device arranged on the first pipeline between the second heat exchanger and the flash evaporator, The air conditioner is provided with a first sensor for detecting the outdoor temperature, a second sensor for detecting the temperature of the radiator, a third sensor for detecting the indoor temperature and a fourth sensor for detecting the exhaust temperature;
The control method comprises the following steps:
acquiring an outdoor temperature threshold, a radiator temperature threshold and air supply temperature conditions, wherein the air supply temperature conditions comprise radiator temperatures corresponding to refrigerants flowing back to a compressor when air supply temperature requirements are met;
Detecting the outdoor temperature of the space where the air conditioner is located;
when the outdoor temperature is not greater than an outdoor temperature threshold value, detecting the temperature of the radiator within a set time length;
When the heat dissipation temperature is not greater than the temperature threshold of the radiator, adjusting the flow opening of the first throttling device to enable the heat dissipation temperature to reach the air supply temperature condition;
The air supply temperature condition comprises the following steps:
The T heat sink is Tao + C,
Wherein the T radiator is the radiator temperature, Tao is the outdoor temperature, and C is a temperature adjusting parameter.
2. The control method according to claim 1, wherein the temperature adjustment parameter has a value in a range of 3-6 ℃.
3. The control method according to claim 2,
The air supply temperature condition also comprises the corresponding exhaust temperature of the compressor when the refrigerant flowing back to the compressor meets the air supply temperature requirement;
The control method further comprises the following steps:
Detecting a discharge temperature of the compressor;
And adjusting the flow opening of the first throttling device according to the exhaust temperature and the exhaust temperature threshold value to enable the exhaust temperature to meet the air supply temperature condition.
4. the control method according to claim 1, characterized by further comprising:
When the outdoor temperature is higher than an outdoor temperature threshold value, the first throttling device is started, so that the temperature of the radiator is not higher than the temperature threshold value of the radiator; or
and when the temperature of the radiator is greater than the temperature threshold of the radiator, opening the first throttling device to enable the temperature of the radiator to be not greater than the temperature threshold of the radiator.
5. the control method according to claim 1, characterized by further comprising:
acquiring real-time indoor temperature and target indoor temperature set by a user;
And determining the flow opening degrees of the second throttling device and the third throttling device according to the temperature difference value between the real-time indoor temperature and the target indoor temperature and the flow opening degree of the first throttling device.
6. The control method according to claim 1, wherein the outdoor temperature threshold has a value ranging from 38 ℃ to 48 ℃ and the radiator temperature threshold has a value ranging from 55 ℃ to 65 ℃.
7. The control device of the air conditioner is characterized in that the air conditioner comprises an indoor unit with a first heat exchanger, an outdoor unit with a second heat exchanger and an intermediate air supply compressor, an electric control is arranged in the outdoor unit, the first heat exchanger, the second heat exchanger and the intermediate air supply compressor are communicated through a first pipeline and a second pipeline and used for forming a refrigerant circulation loop, the air conditioner further comprises a cooling assembly, the cooling assembly is provided with a flash evaporator, a first throttling device and a radiator for dissipating heat of the electric control part, the flash evaporator is connected to the first pipeline, the radiator is respectively communicated with the intermediate air supply compressor and the flash evaporator through a cooling pipeline, the first throttling device is arranged on the cooling pipeline, and the air conditioner is provided with a second throttling device arranged on the first pipeline between the second heat exchanger and the flash evaporator, The air conditioner is provided with a first sensor for detecting the outdoor temperature, a second sensor for detecting the temperature of the radiator, a third sensor for detecting the indoor temperature and a fourth sensor for detecting the exhaust temperature;
the control device includes:
the air supply temperature control device comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring an outdoor temperature threshold, a radiator temperature threshold and air supply temperature conditions, and the air supply temperature conditions comprise radiator temperatures corresponding to refrigerants flowing back to a compressor when air supply temperature requirements are met; and
The air conditioner is used for acquiring the outdoor temperature of the space where the air conditioner is located, which is detected by a first sensor; and the radiator temperature of the radiator detected by the second sensor within a set time length;
the main control unit is used for adjusting the flow opening of the first throttling device when the heat dissipation temperature is not greater than the temperature threshold of the radiator, so that the temperature of the radiator reaches the air supply temperature condition;
The air supply temperature condition comprises the following steps:
The T heat sink is Tao + C,
wherein the T radiator is the radiator temperature, Tao is the outdoor temperature, and C is a temperature adjusting parameter.
8. the control device according to claim 7, wherein the temperature adjustment parameter has a value in a range of 3-6 ℃.
9. The control device according to claim 8,
The air supply temperature condition also comprises the corresponding exhaust temperature of the compressor when the refrigerant flowing back to the compressor meets the air supply temperature requirement;
The acquisition unit is further configured to: acquiring the exhaust temperature of the compressor detected by the fourth sensor;
The main control unit is used for: and adjusting the flow opening of the first throttling device according to the exhaust temperature and the exhaust temperature threshold value to enable the exhaust temperature to meet the air supply temperature condition.
10. the control device according to claim 7,
the main control unit is further configured to: when the outdoor temperature is higher than an outdoor temperature threshold value, the first throttling device is started, so that the temperature of the radiator is not higher than the temperature threshold value of the radiator; or when the temperature of the radiator is greater than the temperature threshold of the radiator, the first throttling device is started, so that the temperature of the radiator is not greater than the temperature threshold of the radiator.
11. The control device according to claim 7,
The acquisition unit is further configured to: acquiring real-time indoor temperature detected by the third sensor and target indoor temperature set by a user;
The main control unit is further configured to: and determining the flow opening degrees of the second throttling device and the third throttling device according to the temperature difference value between the real-time indoor temperature and the target indoor temperature and the flow opening degree of the first throttling device.
12. the air conditioner is characterized by comprising an indoor unit with a first heat exchanger, an outdoor unit with a second heat exchanger and an intermediate air supply compressor, wherein an electric control is arranged in the outdoor unit, the first heat exchanger, the second heat exchanger and the intermediate air supply compressor are communicated through a first pipeline and a second pipeline and are used for forming a refrigerant circulation loop, the air conditioner further comprises a cooling assembly, the cooling assembly is provided with a flash evaporator, a first throttling device and a radiator for dissipating heat of the electric control piece, the flash evaporator is connected to the first pipeline, the radiator is respectively communicated with the intermediate air supply compressor and the flash evaporator through a cooling pipeline, the first throttling device is arranged on the cooling pipeline, and the air conditioner is provided with a second throttling device, a first pipeline and a second throttling device, wherein the second throttling device is arranged on the first pipeline between the second heat exchanger and the flash evaporator, The air conditioner is provided with a first sensor for detecting the outdoor temperature, a second sensor for detecting the temperature of the radiator, a third sensor for detecting the indoor temperature and a fourth sensor for detecting the exhaust temperature; the air conditioner further comprises a control device according to any one of claims 7-11.
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| WO2018141151A1 (en) * | 2017-02-04 | 2018-08-09 | 海尔集团公司 | Air conditioner control method, device and air conditioner |
| CN107388525A (en) * | 2017-08-31 | 2017-11-24 | 广东美的制冷设备有限公司 | Air conditioner and its efficiency computational methods |
| CN107906668B (en) * | 2017-11-03 | 2020-05-22 | 广东美的暖通设备有限公司 | Throttling control method and device of air conditioning system and air conditioner |
| CN108759029B (en) * | 2018-06-19 | 2020-11-03 | 安徽美芝精密制造有限公司 | Air conditioning system, control method of air conditioning system and air conditioner |
| CN113639336A (en) * | 2021-07-05 | 2021-11-12 | 宁波奥克斯电气股份有限公司 | Heat dissipation control method and device and air conditioner |
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