CN110285598B - Enhanced vapor injection air conditioning system and method, enhanced vapor injection air conditioner and readable storage medium - Google Patents

Enhanced vapor injection air conditioning system and method, enhanced vapor injection air conditioner and readable storage medium Download PDF

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Publication number
CN110285598B
CN110285598B CN201910578088.8A CN201910578088A CN110285598B CN 110285598 B CN110285598 B CN 110285598B CN 201910578088 A CN201910578088 A CN 201910578088A CN 110285598 B CN110285598 B CN 110285598B
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throttling element
heat exchange
exchange channel
air conditioning
vapor injection
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CN110285598A (en
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马剑
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Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment Co Ltd
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Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • 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
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/13—Economisers
    • 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
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2513—Expansion valves
    • 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)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention provides an enhanced vapor injection air conditioning system, a control method of the enhanced vapor injection air conditioning system, an enhanced vapor injection air conditioner and a computer readable storage medium, wherein the enhanced vapor injection air conditioning system comprises: the economizer is arranged on a pipeline connecting the inlet of the first heat exchange channel with the indoor heat exchanger; and the control device is connected with the first throttling element and is used for adjusting the opening degree of the first throttling element according to the first measured temperature at the outlet of the first heat exchange channel and the second measured temperature at the inlet of the second heat exchange channel. In the enhanced vapor injection air conditioning system, the superheat degree is calculated through the temperature of the outlet of the first heat exchange channel and the inlet of the second heat exchange channel and is used as an adjusting basis, so that the influence of factors such as the ambient temperature and the like is not required to be considered, the control logic is simplified, and the stability of system control is ensured.

Description

Enhanced vapor injection air conditioning system and method, enhanced vapor injection air conditioner and readable storage medium
Technical Field
The invention relates to the technical field of central air conditioner enthalpy increase, in particular to an enhanced vapor injection air conditioning system, a control method of the enhanced vapor injection air conditioning system, an enhanced vapor injection air conditioner and a computer readable storage medium.
Background
In the conventional central air-conditioning system, along with the continuous reduction of the outdoor temperature, the indoor heating heat load is continuously increased, and various problems such as insufficient heat supply, the increase of the pressure ratio of a compressor, the rapid reduction of the system performance coefficient and the like are caused. At present, most compressors in the central air conditioner are a constant speed technology and a frequency conversion technology, but the heating capacity and the energy efficiency under the ultralow temperature (-20 ℃) working condition can not meet the requirements of users, and particularly in recent years, national governments put higher thresholds on the heating capacity and the energy efficiency of the central air conditioner under the low temperature environment (particularly, -25 ℃ and-20 ℃) in various bidding technical evaluation requirements. In order to solve the problem of bottleneck of low-temperature heating capacity attenuation and improve the heating energy efficiency of a central air conditioner, the energy-saving aspect mainly comprises a variable-frequency enhanced vapor injection technology, a two-stage compression technology and the like at present. The enhanced vapor injection technology has obvious advantages for improving the heating capacity and energy efficiency under the low-temperature working condition and ensuring the long-term stable and reliable operation of the air conditioning unit under the ultralow-temperature environment by integrating all factors.
The control method of the injection valve of the currently common enhanced vapor injection heat pump generally comprises two methods:
(1) the opening degree of an electronic expansion valve of an injection path is adjusted by adopting the superheat degree of an inlet and an outlet of an auxiliary path of the economizer;
(2) the opening degree of an electronic expansion valve of an injection path is adjusted by the superheat degree of a main inlet and an outlet of the economizer.
The two methods need to set different superheat intervals according to different environmental temperatures and different water temperatures, and have the problems of more complex control logic, low fault tolerance rate and larger fluctuation under the control of boundary conditions.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, a first aspect of the present invention proposes an enhanced vapor injection air conditioning system.
The second aspect of the invention provides a control method of an enhanced vapor injection air conditioning system.
A third aspect of the present invention provides an enhanced vapor injection air conditioner.
A fourth aspect of the present invention is directed to a computer-readable storage medium.
In view of the above, a first aspect of the present invention provides an enhanced vapor injection air conditioning system, including a compressor, an indoor heat exchanger, and an outdoor heat exchanger, which are used to form a refrigerant loop, and further including: the economizer is provided with a first heat exchange channel inlet, a first heat exchange channel outlet and a second heat exchange channel inlet, the first heat exchange channel inlet and the second heat exchange channel inlet are connected with a liquid pipe of the indoor heat exchanger, and the first heat exchange channel outlet is connected with a deep spraying opening of the compressor; the first throttling element is arranged on a pipeline connecting the inlet of the first heat exchange channel with the indoor heat exchanger; and the control device is connected with the first throttling element and is used for adjusting the opening degree of the first throttling element according to the first measured temperature at the outlet of the first heat exchange channel and the second measured temperature at the inlet of the second heat exchange channel.
The invention provides an enhanced vapor injection air conditioning system which comprises a compressor, an indoor heat exchanger, an outdoor heat exchanger, an economizer, a first throttling element and a control device, wherein the economizer can be selected as the plate-exchange economizer, the economizer is arranged between the indoor heat exchanger and the outdoor heat exchanger, two heat exchange channels are arranged in the economizer, an inlet and an outlet of the first heat exchange channel are respectively connected with a liquid pipe of the indoor heat exchanger and a jet orifice of the compressor, when the first heat exchange channel is communicated, a refrigerant enters the compressor again to be compressed, the heating capacity of the compressor under severe cold is increased, an inlet and an outlet of the second heat exchange channel are respectively connected with the liquid pipe of the indoor heat exchanger and the outdoor heat exchanger, and when the second heat exchange channel is communicated, a part of the refrigerant directly enters the outdoor heat exchanger through the second heat exchange channel and then enters the compressor again. In the process, the economizer divides the refrigerant after heat release into two parts, one part of the refrigerant enters the outdoor heat exchanger after being decompressed, the other part of the refrigerant is preheated and then is directly sent into the compressor, the injection port supplements the refrigerating gas so as to increase the exhaust volume of the compressor, the problem of compressor power reduction caused by reduction of return air volume of a normal return air port of the compressor when the outdoor temperature is very low is solved, the first throttling element is arranged on a pipeline connecting the inlet of the first heat exchange channel and the indoor heat exchanger and is used for controlling whether the refrigerant after heat release of the indoor heat exchanger enters the first heat exchange channel or not, the first throttling element can select an expansion valve, the controller device is connected with the first throttling element, and the opening degree of the first throttling element can be controlled according to the temperature values of the outlet of the first heat exchange channel and the inlet of the second heat exchange channel, the first throttling element is arranged in the first heat exchange channel, and the opening degree of the first throttling element is controlled so as to control the flow rate of the gas refrigerant directly entering the compressor from the economizer. The method utilizes the outlet temperature of the first heat exchange channel and the inlet temperature of the second heat exchange channel as the regulation basis for regulating the quantity of gas refrigerant entering the compressor of the economizer, has better stability compared with the prior art which utilizes the outlet temperature and the inlet temperature of the first heat exchange channel or the outlet temperature and the inlet temperature of the second heat exchange channel as the regulation basis, has more complex control logic setting and low fault tolerance rate because different superheat degree intervals are set according to different environmental temperatures and other parameters by taking the inlet temperature and the outlet temperature of a single heat exchange channel as the regulation basis, has large flow fluctuation of control when the environmental temperature is in the boundary condition because the environmental temperature has a plurality of boundary conditions, and can not consider the influence of factors such as the environmental temperature by calculating the superheat degree as the regulation basis according to the temperatures at the outlet of the first heat exchange channel and the inlet position of the second heat exchange channel, the stability of system control is guaranteed while the control logic is simplified.
In addition, the enhanced vapor injection air conditioning system in the technical scheme provided by the invention also has the following additional technical characteristics:
in above-mentioned technical scheme, furtherly, the economic ware still includes the export of second heat transfer passageway, and the export of second heat transfer passageway is connected with outdoor heat exchanger's first port, and enhanced vapor injection air conditioning system still includes: the second throttling element is arranged on a pipeline of the second heat exchange channel connected with the outdoor heat exchanger; the control device is connected with the second throttling device and used for acquiring the adjusting parameter of the second throttling element and controlling the first throttling element to adjust the opening after a first preset time after the opening is adjusted by the second throttling element under the condition that the opening is adjusted by the same adjusting parameter of the first throttling element and the second throttling element.
In the technical scheme, the second throttling element is an electronic expansion valve, the second throttling element enables a medium-temperature high-pressure liquid refrigerant to be throttled into low-temperature low-pressure wet steam through the second throttling element, the low-temperature low-pressure wet steam enters the outdoor heat exchanger to absorb heat, the control device is used for controlling the opening degree of the second throttling element, and when the opening degrees of the first throttling element and the second throttling element are adjusted, the flow of the refrigerant in the economizer can fluctuate, so that the detection results of all position detection devices can be influenced, and the first throttling valve and the second throttling valve are always in the state of adjusting the opening degrees. Therefore, when the first throttling element and the second throttling element need to be controlled simultaneously to adjust the opening degree, the control device controls the first throttling element to act after waiting for the first preset time period after controlling the second throttling element to act, and the first throttling element and the second throttling element are prevented from being in a fluctuation state for a long time.
In any of the above technical solutions, further, the enhanced vapor injection air conditioning system further includes: the electromagnetic valve is arranged on a pipeline connecting the outlet of the first heat exchange pipeline and the air suction port of the compressor; the control device is connected with the electromagnetic valve and used for acquiring and controlling the opening parameters of the electromagnetic valve.
In the technical scheme, the electromagnetic valve is a normally closed electromagnetic valve arranged between the economizer and the compressor, the control device is used for controlling the opening degree of the electromagnetic valve, and when the economizer is required to supplement gaseous refrigerants to the compressor, the control device controls the electromagnetic valve to be opened.
In any of the above technical solutions, further, the enhanced vapor injection air conditioning system further includes: the first temperature measuring device is arranged at the outlet of the first heat exchange channel and used for acquiring a first measured temperature; the second temperature measuring device is arranged at the inlet of the second heat exchange channel and used for acquiring a second measured temperature; the first temperature measuring device and the second temperature measuring device are connected with the control device.
In the technical scheme, the first temperature measuring device arranged at the outlet of the first heat exchange channel and the second temperature measuring device arranged at the inlet of the second heat exchange channel are used for obtaining the first measured temperature and the second measured temperature, the control device is connected with the first temperature measuring device and the second temperature measuring device and can obtain the first measured temperature and the second measured temperature, the control device calculates the superheat degree according to the first measured temperature and the second measured temperature, and therefore the opening degree of the first throttling element is controlled according to the superheat degree.
In any of the above technical solutions, further, the enhanced vapor injection air conditioning system further includes: the first port of the low-pressure tank is connected with the return air port of the compressor; a first port of the reversing valve is connected with a second port of the outdoor heat exchanger, a second port of the reversing valve is connected with an exhaust port of the compressor, a third port of the reversing valve is connected with an air pipe of the indoor heat exchanger, and a fourth port of the reversing valve is connected with a second port of the low-pressure tank; the control device is connected with the reversing valve and used for controlling the reversing of the reversing valve.
In the technical scheme, the low-pressure tank is connected with an air return port of the compressor, liquid in an air return pipe can be separated and stored, the compressor is prevented from being impacted by liquid, the flow adjusting function is achieved, the control device is connected with the reversing valve, the control device can control the reversing valve to reverse, a first port, a second port, a third port and a fourth port of the reversing valve are respectively connected with a second port of the outdoor unit heat exchanger, an exhaust port of the compressor, an air pipe of the indoor unit heat exchanger and a second port of the low-pressure tank, and the operation mode of the air conditioning system can be controlled by reversing adjustment of the reversing valve.
A second aspect of the present invention provides a method for controlling an enhanced vapor injection air conditioning system, where in any of the above technical solutions of the enhanced vapor injection air conditioning system, the method includes: acquiring a first measured temperature of an outlet of a first heat exchange channel of the economizer and a second measured temperature of an inlet of a second heat exchange channel of the economizer; and adjusting the opening degree of the first throttling element according to the first measured temperature and the second measured temperature.
The control method of the enhanced vapor injection air conditioning system provided by the invention comprises the steps of acquiring the outlet temperature of a first heat exchange channel and the inlet temperature of a second heat exchange channel as a first measured temperature and a second measured temperature at a control device, calculating the first measured temperature and the second measured temperature to obtain the superheat degree, controlling the opening degree of a first throttling element according to the superheat degree, taking the first measured temperature and the second measured temperature acquired in different heat exchange channels as the adjusting basis for regulating the quantity of gas refrigerants entering a compressor by an economizer, and compared with the prior art that the outlet temperature and the inlet temperature of the first heat exchange channel or the outlet temperature and the inlet temperature of the second heat exchange channel are used as the adjusting basis, the enhanced vapor injection air conditioning system has better stability, because the inlet temperature and the outlet temperature of a single heat exchange channel are used as the basis to set different superheat degree intervals according to other parameters such as different environmental temperatures, the control logic setting is more complex, the fault tolerance rate is not high, and because the environment temperature has a plurality of boundary conditions, when the environment temperature is in the boundary conditions, the flow fluctuation of the control is large, and the superheat degree is calculated through the temperature of the outlet of the first heat exchange channel and the inlet of the second heat exchange channel to be used as the adjusting basis, so that the influence of factors such as the environment temperature and the like can not be considered, the control logic is simplified, and the stability of the system control is also ensured.
In addition, the control method of the enhanced vapor injection air conditioning system in the technical scheme provided by the invention also has the following additional technical characteristics:
in the above technical solution, further, the step of adjusting the opening degree of the first throttling element according to the first measured temperature and the second measured temperature specifically includes: and determining the temperature difference value of the first measured temperature and the second measured temperature, and controlling the first throttling element to adjust the opening once every second preset time according to the opening adjustment relation data according to the temperature difference value.
In the technical scheme, a temperature difference value is calculated according to the first measured temperature and the second measured temperature, the temperature difference value is the superheat degree, adjustment is performed again according to the adjustment relation every second preset time length, and real-time adjustment is performed according to real-time change of the temperature difference value.
In any of the above technical solutions, further, the opening degree adjustment relation data is correspondence data of a temperature difference value, an adjustment step number, and an adjustment direction.
In the technical scheme, the electronic expansion valve is selected as the first throttling element, the electronic expansion valve has expansion valve steps, and the adjustment is carried out according to the corresponding relation between the detected temperature difference and the adjustment expansion step number and the expansion direction, wherein the larger the temperature difference is, the larger the adjustment step number is, the smaller the temperature difference is, the smaller the adjustment step number is, the adjustment direction is positive when the temperature difference is positive, and the adjustment direction is negative when the temperature difference is negative, so that the adjustment of the opening degree of the first throttling element according to different adjustment step numbers and adjustment directions corresponding to different temperature differences is realized, the accuracy of the opening degree adjustment is further improved, and the stability of the system is improved.
In any of the above technical solutions, further, the control method further includes: and acquiring an adjusting parameter of the second throttling element, and controlling the first throttling element to adjust the opening degree after a first preset time after the opening degree of the second throttling element is adjusted on the basis of the condition that the opening degrees of the first throttling element and the second throttling element need to be adjusted synchronously.
In the technical scheme, when the control device receives an adjustment parameter for adjusting the second throttling element, whether the control parameter for the first throttling element is received at the same time is determined, when the opening degrees of the first throttling element and the second throttling element are required to be adjusted at the same time, the second throttling element is controlled firstly, the opening degree of the first throttling element is adjusted after a first preset time period, and meanwhile, when the opening degrees of the first throttling element and the second throttling element are adjusted, the flow of refrigerant in the economizer can fluctuate, so that the detection results of all position detection devices can be influenced, and the first throttling valve and the second throttling valve are always in an opening degree adjustment state. Therefore, when the first throttling element and the second throttling element need to be controlled simultaneously to adjust the opening degree, the control device controls the first throttling element to act after waiting for the first preset time period after controlling the second throttling element to act, and the first throttling element and the second throttling element are prevented from being in a fluctuation state for a long time.
In any of the above technical solutions, further, the control method further includes: and receiving a starting-up instruction, and controlling the first throttling element to adjust to a preset initial opening degree.
According to the technical scheme, when the air conditioning unit is started, the first throttling element is initialized to enable the first throttling element to clear the opening degree of the air conditioning unit before starting, and then the first throttling element is adjusted to the initial opening degree according to the preset opening degree, so that the first throttling element is ensured to be in the set opening degree when the air conditioning unit is restarted every time, and the air conditioning unit cannot be damaged due to unreasonable opening degree.
In any of the above technical solutions, further, after controlling the first throttling element to adjust to the preset opening degree, the method further includes: and after the electromagnetic valve is confirmed to be in the opening state and lasts for a third preset time, executing the step of adjusting the opening degree of the first throttling element according to the first measured temperature and the second measured temperature.
In the technical scheme, after the air conditioning unit is started, the temperatures measured by the first temperature measuring device and the second temperature measuring device are influenced by the ambient temperature, if the first throttling element is directly controlled according to the first measured temperature and the second measured temperature detected when the air conditioning unit is started, deviation is generated, therefore, after the first throttling element is controlled to adjust the value to preset the opening, the electromagnetic valve is opened, the economizer supplements a refrigerant to the compressor, the power of the compressor is increased, after the third preset time duration continues, the step of adjusting the first throttling valve according to the temperature difference is executed, the air conditioning unit system firstly runs for a period of time according to the preset opening of the first throttling valve, the acquired first measured temperature and the acquired second measured temperature are ensured to be kept in a stable state, and then the next step of adjusting the first throttling element is carried out.
In any of the above solutions, further, after the step of adjusting the opening degree of the first throttling element according to the first measured temperature and the second measured temperature, the method further includes: and confirming that the electromagnetic valve is in a closed state again, and adjusting the opening degree of the first throttling element to a preset initial opening degree.
In the technical scheme, the electromagnetic valve is in a normally closed state, when the compressor does not need the economizer to supplement the refrigerant, the electromagnetic valve is controlled to return to the closed state, the refrigerant flowing out of the economizer does not flow into the compressor after the electromagnetic valve is closed, and the first throttling element is controlled to recover to the initial opening degree at the moment, so that the stability of the system is ensured.
A third aspect of the present invention provides an enhanced vapor injection air conditioner comprising a memory storing a computer program, and a processor for executing the control method of the enhanced vapor injection air conditioner control method provided in the second aspect of the present application.
In the technical scheme, the economizer can be selected as a plate-exchange economizer, the economizer is arranged between the indoor heat exchanger and the outdoor heat exchanger and has two heat exchange channels, an inlet and an outlet of the first heat exchange channel are respectively connected with a liquid pipe of the indoor heat exchanger and a compressor jet orifice, when the first heat exchange channel is communicated, a refrigerant enters the compressor again to continue to be compressed, the heating capacity of the compressor under severe cold is increased, an inlet and an outlet of the second heat exchange channel are respectively connected with the liquid pipe of the indoor heat exchanger and the outdoor heat exchanger, and when the second heat exchange channel is communicated, a part of the refrigerant directly enters the outdoor heat exchanger through the second heat exchange channel and then enters the compressor again. In the process, the economizer divides the refrigerant after heat release into two parts, one part of the refrigerant enters the outdoor heat exchanger after being decompressed, the other part of the refrigerant is preheated and then is directly sent into the compressor, the injection port supplements the refrigerating gas so as to increase the exhaust volume of the compressor, the problem of compressor power reduction caused by reduction of return air volume of a normal return air port of the compressor when the outdoor temperature is very low is solved, the first throttling element is arranged on a pipeline connecting the inlet of the first heat exchange channel and the indoor heat exchanger and is used for controlling whether the refrigerant after heat release of the indoor heat exchanger enters the first heat exchange channel or not, the first throttling element can select an expansion valve, the controller device is connected with the first throttling element, and the opening degree of the first throttling element can be controlled according to the temperature values of the outlet of the first heat exchange channel and the inlet of the second heat exchange channel, the first throttling element is arranged in the first heat exchange channel, and the opening degree of the first throttling element is controlled so as to control the flow rate of the gas refrigerant directly entering the compressor from the economizer. The method utilizes the outlet temperature of the first heat exchange channel and the inlet temperature of the second heat exchange channel as the regulation basis for regulating the quantity of gas refrigerant entering the compressor of the economizer, has better stability compared with the prior art which utilizes the outlet temperature and the inlet temperature of the first heat exchange channel or the outlet temperature and the inlet temperature of the second heat exchange channel as the regulation basis, has more complex control logic setting and low fault tolerance rate because different superheat degree intervals are set according to different environmental temperatures and other parameters by taking the inlet temperature and the outlet temperature of a single heat exchange channel as the regulation basis, has large flow fluctuation of control when the environmental temperature is in the boundary condition because the environmental temperature has a plurality of boundary conditions, and can not consider the influence of factors such as the environmental temperature by calculating the superheat degree as the regulation basis according to the temperatures at the outlet of the first heat exchange channel and the inlet position of the second heat exchange channel, the stability of system control is guaranteed while the control logic is simplified.
In addition, the enhanced vapor injection air conditioner in the technical scheme provided by the invention also has the following additional technical characteristics:
in any of the above technical solutions, further, the process of adjusting the opening degree of the first throttling element by the processor according to the first measured temperature and the second measured temperature specifically includes: and determining the temperature difference value of the first measured temperature and the second measured temperature, and controlling the first throttling element to adjust the opening once every second preset time according to the opening adjustment relation data according to the temperature difference value.
In the technical scheme, a temperature difference value is calculated according to the first measured temperature and the second measured temperature, the temperature difference value is the superheat degree, adjustment is performed again according to the adjustment relation every second preset time length, and real-time adjustment is performed according to real-time change of the temperature difference value.
In any of the above technical solutions, further, the opening degree adjustment relation data is corresponding relation data of a temperature difference value, an adjustment step number, and an adjustment direction, where the temperature difference value and the adjustment step number are in a positive correlation.
In the technical scheme, the electronic expansion valve is selected as the first throttling element, the electronic expansion valve has expansion valve steps, and the adjustment is carried out according to the corresponding relation between the detected temperature difference and the adjustment expansion step number and the expansion direction, wherein the larger the temperature difference is, the larger the adjustment step number is, the smaller the temperature difference is, the smaller the adjustment step number is, the adjustment direction is positive when the temperature difference is positive, and the adjustment direction is negative when the temperature difference is negative, so that the adjustment of the opening degree of the first throttling element according to different adjustment step numbers and adjustment directions corresponding to different temperature differences is realized, the accuracy of the opening degree adjustment is further improved, and the stability of the system is improved.
In any of the above technical solutions, further, the enhanced vapor injection air conditioner further includes an electromagnetic valve disposed on a pipeline connecting an outlet of the first heat exchange pipeline and an air suction port of the compressor, and the processor is further configured to: and acquiring an adjusting parameter of the second throttling element, and controlling the first throttling element to adjust the opening after a first preset time after the opening is adjusted by the second throttling element on the basis of the condition that the opening is adjusted by the first throttling element and the second throttling element with the same adjusting parameter.
In the technical scheme, when the control device receives an adjustment parameter for adjusting the second throttling element, whether the control parameter for the first throttling element is received at the same time is determined, when the opening degrees of the first throttling element and the second throttling element are required to be adjusted at the same time, the second throttling element is controlled firstly, the opening degree of the first throttling element is adjusted after a first preset time period, and meanwhile, when the opening degrees of the first throttling element and the second throttling element are adjusted, the flow of refrigerant in the economizer can fluctuate, so that the detection results of all position detection devices can be influenced, and the first throttling valve and the second throttling valve are always in an opening degree adjustment state. Therefore, when the first throttling element and the second throttling element need to be controlled simultaneously to adjust the opening degree, the control device controls the first throttling element to act after waiting for the first preset time period after controlling the second throttling element to act, and the first throttling element and the second throttling element are prevented from being in a fluctuation state for a long time.
In any of the above technical solutions, further, the processor is further configured to: and receiving a starting-up instruction, and controlling the first throttling element to adjust to a preset initial opening degree.
According to the technical scheme, when the air conditioning unit is started, the first throttling element is initialized to enable the first throttling element to clear the opening degree of the air conditioning unit before starting, and then the first throttling element is adjusted to the initial opening degree according to the preset opening degree, so that the first throttling element is ensured to be in the set opening degree when the air conditioning unit is restarted every time, and the air conditioning unit cannot be damaged due to unreasonable opening degree.
In any of the above technical solutions, further, after controlling the first throttling element to adjust to the preset opening degree, the processor is further configured to: and after the electromagnetic valve is confirmed to be in the opening state and lasts for a third preset time, executing the step of adjusting the opening degree of the first throttling element according to the first measured temperature and the second measured temperature.
In the technical scheme, after the air conditioning unit is started, the temperatures measured by the first temperature measuring device and the second temperature measuring device are influenced by the ambient temperature, if the first throttling element is directly controlled according to the first measured temperature and the second measured temperature detected when the air conditioning unit is started, deviation is generated, therefore, after the first throttling element is controlled to adjust the value to preset the opening, the electromagnetic valve is opened, the economizer supplements a refrigerant to the compressor, the power of the compressor is increased, after the third preset time duration continues, the step of adjusting the first throttling valve according to the temperature difference is executed, the air conditioning unit system firstly runs for a period of time according to the preset opening of the first throttling valve, the acquired first measured temperature and the acquired second measured temperature are ensured to be kept in a stable state, and then the next step of adjusting the first throttling element is carried out.
In any of the above technical solutions, further, after adjusting the opening degree of the first throttling element according to the first measured temperature and the second measured temperature, the processor is further configured to: and confirming that the electromagnetic valve is in a closed state again, and adjusting the opening degree of the first throttling element to a preset initial opening degree.
In the technical scheme, the electromagnetic valve is in a normally closed state, when the compressor does not need the economizer to supplement the refrigerant, the electromagnetic valve is controlled to return to the closed state, the refrigerant flowing out of the economizer does not flow into the compressor after the electromagnetic valve is closed, and the first throttling element is controlled to recover to the initial opening degree at the moment, so that the stability of the system is ensured.
A fourth aspect of the present invention provides a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the method for controlling an enhanced vapor injection air conditioning system according to any one of the above-mentioned aspects, and therefore, the computer-readable storage medium includes all the advantageous effects of the method for controlling an enhanced vapor injection air conditioning system according to any one of the above-mentioned aspects.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a block diagram of a practical enhanced vapor injection air conditioning system according to the present invention;
FIG. 2 illustrates a flow diagram of a method of controlling an enhanced vapor injection air conditioning system according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart diagram illustrating a method of controlling an enhanced vapor injection air conditioning system according to another embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating an adjustment relationship between a temperature difference and an adjustment step number according to an embodiment of the present invention;
FIG. 5 is a schematic flow chart diagram illustrating a method of controlling an enhanced vapor injection air conditioning system according to yet another embodiment of the present invention;
FIG. 6 is a flow chart illustrating a method of controlling an enhanced vapor injection air conditioning system according to yet another embodiment of the present invention;
FIG. 7 is a flow chart illustrating a method of controlling an enhanced vapor injection air conditioning system according to yet another embodiment of the present invention;
FIG. 8 illustrates a schematic block diagram of a enhanced vapor injection air conditioner in accordance with one embodiment of the present invention.
Wherein, the correspondence between the reference numbers and the component names in fig. 1 and fig. 8 is:
the system comprises a compressor 10, an indoor heat exchanger 20, an outdoor heat exchanger 30, an economizer 40, a first heat exchange channel inlet 41, a first heat exchange channel outlet 42, a second heat exchange channel inlet 43, a second heat exchange channel outlet 44, a first throttling element 50, a second throttling element 60, a solenoid valve 70, a low-pressure tank 80, a reversing valve 90, a first temperature measuring device 100, a second temperature measuring device 110, a jet enthalpy-increasing air conditioning system 200, a storage 210 and a processor 220.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
Referring now to FIG. 1, a enhanced vapor injection air conditioning system provided in accordance with some embodiments of the present invention will be described.
Referring to fig. 1, an embodiment of the first aspect of the present invention provides an enhanced vapor injection air conditioning system, including a compressor 10, an indoor heat exchanger 20, and an outdoor heat exchanger 30, which form a refrigerant circuit, and further including: an economizer 40 having a first heat exchange channel inlet 41, a first heat exchange channel outlet 42, and a second heat exchange channel inlet 43, wherein the first heat exchange channel inlet 41 and the second heat exchange channel inlet 43 are connected to a liquid pipe of the indoor heat exchanger 20, and the first heat exchange channel outlet 42 is connected to a depth nozzle of the compressor 10; a first throttling element 50 provided on a pipe line connecting the first heat exchange passage inlet 41 and the indoor heat exchanger 20; and the control device is connected with the first throttling element 50 and is used for adjusting the opening degree of the first throttling element 50 according to the first measured temperature of the first heat exchange channel outlet 42 and the second measured temperature of the second heat exchange channel inlet 43.
The enhanced vapor injection air conditioning system provided by the embodiment comprises a compressor 10, an indoor heat exchanger 20, an outdoor heat exchanger 30, an economizer 40, a first throttling element 50 and a control device, wherein the economizer 40 can be selected from the plate-type economizer 40, the economizer 40 is arranged between the indoor heat exchanger 20 and the outdoor heat exchanger 30, the economizer 40 is provided with two heat exchange channels, the inlet and the outlet of the first heat exchange channel are respectively connected with a liquid pipe of the indoor heat exchanger 20 and an injection port of the compressor 10, when the first heat exchange channel is communicated, a refrigerant enters the compressor 10 again to be compressed continuously, the heating capacity of the compressor 10 under severe cold is increased, the inlet and the outlet of the second heat exchange channel are respectively connected with the liquid pipe of the indoor heat exchanger 20 and the outdoor heat exchanger 30, when the second heat exchange channel is communicated, a part of the refrigerant directly enters the outdoor heat exchanger 30 through the second heat exchange channel, and again into the compressor 10. In the process, the economizer 40 divides the refrigerant after heat release into two parts, one part of the refrigerant is decompressed and enters the outdoor heat exchanger 30, the other part of the refrigerant is preheated and then is directly sent into the compressor 10, the refrigerating gas is supplemented through an injection port so as to increase the exhaust amount of the compressor 10, the problem of the power reduction of the compressor 10 caused by the reduction of the return air amount of a normal return air port of the compressor 10 when the outdoor temperature is very low is solved, the first throttling element 50 is arranged on a pipeline connecting the first heat exchange channel inlet 41 and the indoor heat exchanger 20 and is used for controlling whether the refrigerant after heat release of the indoor heat exchanger 20 enters the first heat exchange channel or not, the first throttling element 50 can select an expansion valve, the controller device is connected with the first throttling element 50, and the opening degree of the first throttling element 50 can be controlled according to the temperature values of the first heat exchange channel outlet 42 and the second heat exchange channel inlet 43, since the first throttling element 50 is disposed in the first heat exchanging passage, the opening degree of the first throttling element 50 is controlled to control the flow rate of the gas refrigerant directly entering the compressor 10 from the economizer 40. The temperature of the outlet 42 of the first heat exchange channel and the temperature of the inlet 43 of the second heat exchange channel are used as the adjusting basis for regulating the amount of the gas refrigerant entering the compressor 10 from the economizer 40, compared with the prior art that the temperature of the outlet 42 of the first heat exchange channel and the temperature of the inlet of the second heat exchange channel or the temperature of the outlet 44 of the second heat exchange channel and the temperature of the inlet of the second heat exchange channel are used as the adjusting basis, the method has better stability, because the temperature of the inlet and the outlet of a single heat exchange channel is used as the adjusting basis to set different superheat degree intervals according to different environmental temperatures and other parameters, the setting of control logic is more complicated, the fault tolerance rate is not high, and because the environmental temperature has a plurality of boundary conditions, when the environmental temperature is in the boundary conditions, the fluctuation of the controlled flow is large, and the influence of factors such as the environmental temperature can not be considered by calculating, the stability of system control is guaranteed while the control logic is simplified.
In one embodiment of the present invention, as shown in fig. 1, further, the economizer 40 further comprises a second heat exchange channel outlet 44, the second heat exchange channel outlet 44 is connected to the first port of the outdoor heat exchanger 30, and the enhanced vapor injection air conditioning system further comprises: a second throttling element 60 disposed on a pipe of the second heat exchange passage connected to the outdoor heat exchanger 30; the control device is connected with the second throttling device and is used for acquiring the adjusting parameter of the second throttling element 60, and controlling the first throttling element 50 to adjust the opening degree after a first preset time after the opening degree of the second throttling element 60 is adjusted under the condition that the opening degree of the first throttling element 50 and the opening degree of the second throttling element 60 are adjusted by the same adjusting parameter.
In this embodiment, the second throttling element 60 is an electronic expansion valve, the second throttling element 60 throttles the medium-temperature high-pressure liquid refrigerant into low-temperature low-pressure wet vapor through the electronic expansion valve, and the low-temperature low-pressure wet vapor enters the outdoor heat exchanger 30 to absorb heat, and the control device is configured to control the opening degree of the second throttling element 60, and when the opening degrees of the first throttling element 50 and the second throttling element 60 are adjusted at the same time, the flow of the refrigerant in the economizer 40 fluctuates, so that the detection results of the position detection devices are affected, and the first throttling valve and the second throttling valve are always in the state of adjusting the opening degrees. Therefore, when the first throttling element 50 and the second throttling element 60 need to be controlled simultaneously to adjust the opening degrees, the control device controls the first throttling element 50 to act after waiting for a first preset time period after controlling the second throttling element 60 to act, and the first throttling element 50 and the second throttling element 60 are prevented from being in a fluctuating state for a long time.
In one embodiment of the present invention, as shown in fig. 1, further, the enhanced vapor injection air conditioning system further comprises: an electromagnetic valve 70 disposed on a pipeline connecting the outlet of the first heat exchange pipeline with the suction port of the compressor 10; the control device is connected with the electromagnetic valve 70 and is used for acquiring and controlling the opening parameter of the electromagnetic valve 70.
In this embodiment, the electromagnetic valve 70 is a normally closed electromagnetic valve 70 disposed between the economizer 40 and the compressor 10, the control device is configured to control an opening degree of the electromagnetic valve 70, and the control device controls the electromagnetic valve 70 to open when the economizer 40 is required to supplement the gaseous refrigerant to the compressor 10.
In one embodiment of the present invention, as shown in fig. 1, further, the enhanced vapor injection air conditioning system further comprises: the first temperature measuring device 100 is arranged at the outlet 42 of the first heat exchange channel and used for obtaining a first measured temperature; the second temperature measuring device 110 is arranged at the inlet 43 of the second heat exchange channel and used for obtaining a second measured temperature; the first temperature measuring device 100 and the second temperature measuring device 110 are connected with the control device.
In this embodiment, the first temperature measuring device 100 disposed at the outlet of the first heat exchange passage and the second temperature measuring device 110 disposed at the inlet 43 of the second heat exchange passage are used to obtain the first measured temperature and the second measured temperature, the control device is connected to the first temperature measuring device 100 and the second temperature measuring device 110 to obtain the first measured temperature and the second measured temperature, and the control device calculates the degree of superheat according to the first measured temperature and the second measured temperature to control the opening degree of the first throttling element 50 according to the degree of superheat.
In one embodiment of the present invention, as shown in fig. 1, further, the enhanced vapor injection air conditioning system further comprises: a low pressure tank 80 having a first port connected to a return port of the compressor 10; a first port of the reversing valve 90 is connected with a second port of the outdoor heat exchanger, a second port of the reversing valve 90 is connected with an exhaust port of the compressor 10, a third port of the reversing valve 90 is connected with an air pipe of the indoor heat exchanger, and a fourth port of the reversing valve 90 is connected with a second port of the low-pressure tank 80; the control device is connected with the reversing valve 90 and is used for controlling the reversing valve 90 to reverse.
In the air conditioning system of the invention, the exhaust pipe of the compressor 10 is controlled to be communicated with the air pipe of the indoor unit through the reversing valve 90, the liquid pipe of the outdoor unit is communicated with the low-pressure tank 80 to enter a heating mode, a gas refrigerant enters the compressor 10 and is pressurized by the compressor 10 to become high-temperature and high-pressure gas, the gas refrigerant enters the heat exchanger of the indoor unit through the reversing valve 90 through the exhaust port, the refrigerant is condensed and liquefied in the indoor heat exchanger 20 to release heat, the gas refrigerant becomes liquid, the liquid refrigerant enters the economizer 40 to be divided, the pressure is reduced through the throttling element, one part of the liquid refrigerant directly enters the outdoor unit to exchange heat and then enters the low-pressure tank 80, the liquid refrigerant returns to the compressor 10 through the return air port, and the other part of the liquid refrigerant directly enters the compressor 10. The exhaust pipe of the compressor 10 is controlled to be connected with the outdoor heat exchanger through the reversing valve 90, the liquid outlet of the indoor unit is connected with the low-pressure tank 80, the compressor 10 compresses the gaseous refrigerant into a high-temperature high-pressure gaseous refrigerant, the gaseous refrigerant is sent to the outdoor unit for heat dissipation to form a normal-temperature high-pressure refrigerant, the liquid high-pressure refrigerant enters the indoor unit through the economizer 40, the liquid refrigerant can be vaporized to absorb heat, the refrigerating effect is achieved, and the gaseous refrigerant flows back into the compressor 10 from the indoor unit through the reversing valve 90.
In this embodiment, the low pressure tank 80 is connected to the return air port of the compressor 10, so as to separate and store the liquid in the return air pipe, thereby preventing the compressor 10 from liquid impact and achieving the function of regulating the flow rate, the control device is connected to the reversing valve 90, so that the control device can control the reversing valve 90 to reverse, and the first port, the second port, the third port and the fourth port of the reversing valve 90 are respectively connected to the second port of the outdoor heat exchanger, the exhaust port of the compressor 10, the air pipe of the indoor heat exchanger and the second port of the low pressure tank 80, so as to control the operation mode of the air conditioning system by reversing regulation of the reversing valve 90.
As shown in fig. 2, an embodiment of a second aspect of the present invention provides a control method for an enhanced vapor injection air conditioning system, including the enhanced vapor injection air conditioning system as described in any of the embodiments of the first aspect, the control method comprising:
s102, acquiring a first measured temperature of an outlet of a first heat exchange channel of the economizer and a second measured temperature of an inlet of a second heat exchange channel of the economizer;
and S104, adjusting the opening degree of the first throttling element according to the first measured temperature and the second measured temperature.
The control method of the enhanced vapor injection air conditioning system provided by the invention comprises the steps of acquiring the outlet temperature of a first heat exchange channel and the inlet temperature of a second heat exchange channel as a first measured temperature and a second measured temperature at a control device, calculating the first measured temperature and the second measured temperature to obtain the superheat degree, controlling the opening degree of a first throttling element according to the superheat degree, taking the first measured temperature and the second measured temperature acquired in different heat exchange channels as the adjusting basis for regulating the quantity of gas refrigerants entering a compressor by an economizer, and compared with the prior art that the outlet temperature and the inlet temperature of the first heat exchange channel or the outlet temperature and the inlet temperature of the second heat exchange channel are used as the adjusting basis, the enhanced vapor injection air conditioning system has better stability, because the inlet temperature and the outlet temperature of a single heat exchange channel are used as the basis to set different superheat degree intervals according to other parameters such as different environmental temperatures, the control logic setting is more complex, the fault tolerance rate is not high, and because the environment temperature has a plurality of boundary conditions, when the environment temperature is in the boundary conditions, the flow fluctuation of the control is large, and the superheat degree is calculated through the temperature of the outlet of the first heat exchange channel and the inlet of the second heat exchange channel to be used as the adjusting basis, so that the influence of factors such as the environment temperature and the like can not be considered, the control logic is simplified, and the stability of the system control is also ensured.
As shown in fig. 3, another embodiment of the present invention provides a method for controlling an enhanced vapor injection air conditioning system, further comprising:
s202, acquiring a first measured temperature of an outlet of a first heat exchange channel of the economizer and a second measured temperature of an inlet of a second heat exchange channel of the economizer;
and S204, determining a temperature difference value between the first measured temperature and the second measured temperature, and controlling the first throttling element to adjust the opening once every second preset time according to the opening adjustment relation data according to the temperature difference value.
In the embodiment, a temperature difference value is calculated according to the first measured temperature and the second measured temperature, the temperature difference value is the superheat degree, and the adjustment is performed again according to the adjustment relation every second preset time period, so that the real-time adjustment is performed according to the real-time change of the temperature difference value.
Another embodiment of the present invention provides a method for controlling an enhanced vapor injection air conditioning system, further comprising: the opening degree adjustment relation data is corresponding relation data of the temperature difference value, the adjustment step number and the adjustment direction.
In this embodiment, the first throttling element is an electronic expansion valve, and the electronic expansion valve has an expansion valve step number, and is adjusted according to the detected temperature difference and the corresponding relationship between the adjustment expansion step number and the expansion direction. The positive correlation relationship between the temperature difference value and the adjustment step number can be set, wherein the larger the temperature difference value is, the larger the adjustment step number is, the smaller the temperature difference value is, the smaller the adjustment step number is, the adjustment direction is positive when the temperature difference is positive, and the adjustment direction is negative when the temperature difference is negative, so that the adjustment of the opening degree of the first throttling element by corresponding to different adjustment step numbers and adjustment directions according to different temperature differences is realized, the accuracy of the opening degree adjustment is further improved, and the stability of the system is improved.
As shown in the adjustment relationship of fig. 4, different adjustment steps P correspond to different temperature differences T, where the temperature difference T and the adjustment steps P are in positive correlation, i.e. the larger the temperature difference T, the larger the increment of the adjustment steps P.
Another embodiment of the present invention provides a control method of an enhanced vapor injection air conditioning system, further comprising: and acquiring an adjusting parameter of the second throttling element, and controlling the first throttling element to adjust the opening degree after a first preset time after the opening degree of the second throttling element is adjusted on the basis of the condition that the opening degrees of the first throttling element and the second throttling element need to be adjusted synchronously.
In this embodiment, when the control device receives an adjustment parameter for adjusting the second throttling element, it is determined whether the control parameter for the first throttling element is received at the same time, when the opening degrees of the first throttling element and the second throttling element need to be adjusted at the same time, the second throttling element is controlled first, the opening degree of the first throttling element is adjusted after a first preset time period, and when the opening degrees of the first throttling element and the second throttling element are adjusted at the same time, the flow of the refrigerant in the economizer fluctuates, so that the detection results of the position detection devices are affected, and the first throttling valve and the second throttling valve are in the state of adjusting the opening degrees all the time. Therefore, when the first throttling element and the second throttling element need to be controlled simultaneously to adjust the opening degree, the control device controls the first throttling element to act after waiting for the first preset time period after controlling the second throttling element to act, and the first throttling element and the second throttling element are prevented from being in a fluctuation state for a long time.
As shown in fig. 5, another embodiment of the present invention provides a method for controlling an enhanced vapor injection air conditioning system, further comprising:
s302, receiving a starting-up instruction, and controlling the first throttling element to adjust to a preset initial opening degree;
s304, judging whether the electromagnetic valve is in an opening state and continues for a third preset time, if so, executing S306, otherwise, continuing to execute S304;
s306, acquiring a first measured temperature of an outlet of a first heat exchange channel of the economizer and a second measured temperature of an inlet of a second heat exchange channel of the economizer;
and S308, determining a temperature difference value between the first measured temperature and the second measured temperature, and controlling the first throttling element to adjust the opening once every second preset time according to the opening adjustment relation data according to the temperature difference value.
In this embodiment, after the air conditioning unit is started, the temperatures measured by the first temperature measuring device and the second temperature measuring device are affected by the ambient temperature, and if the first throttling element is controlled to generate a deviation directly according to the first measured temperature and the second measured temperature detected immediately after the air conditioning unit is started, the electromagnetic valve is opened after the adjustment value of the first throttling element is controlled to a preset opening degree, so that the economizer supplements a refrigerant to the compressor, so that the power of the compressor is increased, after a third preset time period continues, the step of adjusting the first throttling valve according to the temperature difference is executed, so that the air conditioning unit system operates for a period of time according to the preset opening degree of the first throttling valve, and the collected first measured temperature and the collected second measured temperature are kept in a stable state, and then the next step of adjusting the first throttling element is executed.
As shown in fig. 6, another embodiment of the present invention provides a method for controlling an enhanced vapor injection air conditioning system, further comprising:
s402, receiving a starting-up instruction, and controlling the first throttling element to adjust to a preset initial opening degree;
s404, judging whether the electromagnetic valve is in an opening state and continues for a third preset time, if so, executing S406, otherwise, continuing to execute S404;
s406, acquiring a first measured temperature of an outlet of a first heat exchange channel of the economizer and a second measured temperature of an inlet of a second heat exchange channel of the economizer;
s408, determining a temperature difference value between the first measured temperature and the second measured temperature, and controlling the first throttling element to adjust the opening once every second preset time according to the opening adjustment relation data according to the temperature difference value.
S410, judging whether the electromagnetic valve is in a closed state, if so, executing S412, and if not, executing S406;
s412, adjusting the opening degree of the first throttling element to a preset initial opening degree.
In the technical scheme, the electromagnetic valve is in a normally closed state, when the compressor does not need the economizer to supplement the refrigerant, the electromagnetic valve is controlled to return to the closed state, the refrigerant flowing out of the economizer does not flow into the compressor after the electromagnetic valve is closed, and the first throttling element is controlled to recover to the initial opening degree at the moment, so that the stability of the system is ensured.
As shown in fig. 7, another embodiment of the present invention provides a method for controlling an enhanced vapor injection air conditioning system, further comprising:
s502, receiving a starting-up instruction, and controlling the first throttling element to adjust to a preset initial opening degree;
s504, judging whether the electromagnetic valve needs to be opened, if so, executing S506, otherwise, continuing to execute S504;
s506, opening the electromagnetic valve;
s508, judging whether the electromagnetic valve is in an opening state and continues for a third preset time, if so, executing S510, otherwise, continuing to execute S508;
s510, acquiring a first measured temperature of an outlet of a first heat exchange channel of the economizer and a second measured temperature of an inlet of a second heat exchange channel of the economizer;
s512, determining a temperature difference value between the first measured temperature and the second measured temperature, and controlling the first throttling element to adjust the opening once every second preset time according to the opening adjustment relation data according to the temperature difference value.
S514, judging whether the electromagnetic valve needs to be closed, if so, executing S516, and if not, executing S510;
and S516, closing the electromagnetic valve, and adjusting the opening degree of the first throttling element to a preset initial opening degree.
In this embodiment, after the first throttling element is controlled to be adjusted to the preset opening degree during startup, whether the electromagnetic valve is opened is determined by determining whether the compressor needs to be supplemented with a refrigerant by the economizer, after the electromagnetic valve is opened, the refrigerant in the economizer enters the compressor and starts to adjust the opening degree of the first throttling element according to a temperature difference, and when the electromagnetic valve needs to be closed, the electromagnetic valve is closed and the opening degree of the first throttling element is restored to the initial opening degree, so that the stability of the system is ensured.
As shown in fig. 8, in an embodiment of the third aspect of the present invention, there is provided a enhanced vapor injection air conditioner 200, comprising a memory 210 for storing a computer program; a processor 220 for executing a computer program to implement the method for controlling the enhanced vapor injection air conditioning system of the second aspect of the present invention. Therefore, the enhanced vapor injection air conditioner comprises all the beneficial effects of the enhanced vapor injection air conditioner control method in any one of the embodiments.
In an embodiment of the fourth aspect of the present invention, a computer readable storage medium is provided, on which a computer program is stored, which computer program, when being executed by a processor, is adapted to carry out the enhanced vapor injection air conditioning system according to any of the above embodiments, whereby the computer readable storage medium comprises all the advantageous effects of the enhanced vapor injection air conditioning system according to any of the above embodiments.
In the description of the present invention, the terms "plurality" or "a plurality" refer to two or more, and unless otherwise specifically limited, the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In the present invention, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (13)

1. The utility model provides a jet enthalpy-increasing air conditioning system, includes compressor, indoor heat exchanger, the outdoor heat exchanger that is used for forming the refrigerant return circuit, its characterized in that still includes:
the economizer is provided with a first heat exchange channel inlet, a first heat exchange channel outlet and a second heat exchange channel inlet, the first heat exchange channel inlet and the second heat exchange channel inlet are connected with the indoor heat exchanger, and the first heat exchange channel outlet is connected with the injection port of the compressor;
the first throttling element is arranged on a pipeline connecting the inlet of the first heat exchange channel with the indoor heat exchanger;
the control device is connected with the first throttling element and used for adjusting the opening degree of the first throttling element according to the first measured temperature of the outlet of the first heat exchange channel and the second measured temperature of the inlet of the second heat exchange channel;
the economizer still includes the export of second heat transfer passageway, the export of second heat transfer passageway with outdoor heat exchanger's first port is connected, enhanced vapor injection air conditioning system still includes:
the second throttling element is arranged on a pipeline of the second heat exchange channel connected with the outdoor heat exchanger;
the control device is connected with the second throttling element and used for acquiring the adjusting parameter of the second throttling element and controlling the first throttling element to adjust the opening degree after a first preset time after the opening degree is adjusted by the second throttling element under the condition that the opening degree is adjusted by the same adjusting parameter of the first throttling element and the second throttling element.
2. The enhanced vapor injection air conditioning system of claim 1 further comprising:
the electromagnetic valve is arranged on a pipeline connecting the outlet of the first heat exchange channel with the air suction port of the compressor;
the control device is connected with the electromagnetic valve and used for acquiring and controlling the opening parameter of the electromagnetic valve.
3. The enhanced vapor injection air conditioning system of claim 1 or 2, further comprising:
the first temperature measuring device is arranged at the outlet of the first heat exchange channel and used for acquiring the first measured temperature;
the second temperature measuring device is arranged at the inlet of the second heat exchange channel and used for acquiring the second measured temperature;
the first temperature measuring device and the second temperature measuring device are connected with the control device.
4. The enhanced vapor injection air conditioning system of claim 3 further comprising:
a low pressure tank, a first port of which is connected with a return air port of the compressor;
a first port of the reversing valve is connected with a second port of the outdoor heat exchanger, a second port of the reversing valve is connected with an exhaust port of the compressor, a third port of the reversing valve is connected with an air pipe of the indoor heat exchanger, and a fourth port of the reversing valve is connected with a second port of the low-pressure tank;
the control device is connected with the reversing valve and used for controlling the reversing of the reversing valve.
5. A control method of an enhanced vapor injection air conditioning system, wherein the enhanced vapor injection air conditioning system is the enhanced vapor injection air conditioning system according to any one of claims 1 to 4, the control method comprising:
acquiring a first measured temperature of an outlet of a first heat exchange channel of the economizer and a second measured temperature of an inlet of a second heat exchange channel of the economizer;
and adjusting the opening degree of the first throttling element according to the first measured temperature and the second measured temperature.
6. The method for controlling an enhanced vapor injection air conditioning system according to claim 5, wherein the step of adjusting the opening degree of the first throttling element according to the first measured temperature and the second measured temperature specifically comprises:
and determining the temperature difference value of the first measured temperature and the second measured temperature, and controlling the first throttling element to adjust the opening once every second preset time according to the opening adjustment relation data according to the temperature difference value.
7. The method of controlling an enhanced vapor injection air conditioning system according to claim 6,
the opening degree adjustment relation data is corresponding relation data of a temperature difference value, an adjustment step number and an adjustment direction.
8. The control method of an enhanced vapor injection air conditioning system according to claim 6, further comprising a solenoid valve disposed on a pipe connecting an outlet of the first heat exchange passage with a suction port of the compressor, and a second throttling element disposed on a pipe connecting a second heat exchange passage of the economizer with the outdoor heat exchanger, wherein the control method further comprises:
and acquiring an adjustment parameter of the second throttling element, and controlling the first throttling element to adjust the opening degree after a first preset time after the opening degree is adjusted by the second throttling element on the basis of the condition that the opening degree is adjusted by the first throttling element and the second throttling element with the same adjustment parameter.
9. Method for controlling a enhanced vapor injection air conditioning system according to any one of claims 5 to 8, characterized in that it further comprises:
and receiving a starting-up instruction, and controlling the first throttling element to adjust to a preset initial opening degree.
10. The method for controlling an enhanced vapor injection air conditioning system according to claim 9, further comprising, after controlling the first throttling element to adjust to a preset opening degree:
and after the electromagnetic valve is confirmed to be in an opening state and lasts for a third preset time, executing the step of adjusting the opening degree of the first throttling element according to the first measured temperature and the second measured temperature.
11. The method of controlling an enhanced vapor injection air conditioning system according to claim 10, further comprising, after the step of adjusting the opening degree of the first throttling element according to the first and second measured temperatures:
and confirming that the electromagnetic valve is in a closed state again, and adjusting the opening degree of the first throttling element to the preset initial opening degree.
12. An enhanced vapor injection air conditioner, comprising:
a memory for storing a computer program;
a processor for executing the computer program to implement:
a method of controlling an enhanced vapor injection air conditioning system according to any one of claims 5 to 11.
13. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out a method for controlling a enhanced vapor injection air conditioning system according to any one of claims 5 to 11.
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CN111442559B (en) * 2020-04-13 2022-07-26 广东美的暖通设备有限公司 Enhanced vapor injection system, control method and device thereof, heating equipment and electronic equipment
CN114992924A (en) * 2021-03-02 2022-09-02 广东美的暖通设备有限公司 Economizer opening temperature determination method and device and air conditioning system
CN114992908B (en) * 2021-03-02 2023-12-22 广东美的暖通设备有限公司 Heat pump system, control method of heat pump system, and readable storage medium
CN114992907B (en) * 2021-03-02 2024-03-19 广东美的暖通设备有限公司 Control method of heat pump system, heat pump system and readable storage medium
CN115962529B (en) * 2023-02-20 2024-07-23 广东美的制冷设备有限公司 Air conditioning system, enthalpy injection control method for air conditioning system, and readable storage medium

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