CN109855281B - Air conditioner heat exchange device and air conditioner - Google Patents
Air conditioner heat exchange device and air conditioner Download PDFInfo
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- CN109855281B CN109855281B CN201811516705.3A CN201811516705A CN109855281B CN 109855281 B CN109855281 B CN 109855281B CN 201811516705 A CN201811516705 A CN 201811516705A CN 109855281 B CN109855281 B CN 109855281B
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Abstract
The invention provides an air conditioner heat exchange device and an air conditioner, wherein the heat exchange device comprises a plurality of heat exchangers which are arranged in parallel, each heat exchanger is independently provided with an electronic expansion valve which can be used for controlling the flow of a refrigerant, the air conditioner heat exchange device also comprises a processor and a memory, the memory stores a computer program, and the following steps can be realized when the program is executed by the processor: collecting parameters of the interior and the environment of the air conditioner, and obtaining a correction coefficient K according to the parameters; detecting the related temperature of the heat exchanger and the related pressure of the compressor, comparing the temperature with a preset value, and calculating to obtain the change amount of the opening of the electronic expansion valve; calculating the change amount of the opening of the electronic expansion valve, the current opening EVO (n) of the electronic expansion valve and a correction coefficient to obtain a calculated value EVO (n +1), and regulating and controlling the opening of the electronic expansion valve according to the calculated value EVO (n + 1); and repeating the steps to continuously regulate and control the electronic expansion valve. The air conditioner of the invention adopts the air conditioner heat exchange device. The invention can realize the balance and high efficiency of the heat exchange of the air conditioner.
Description
Technical Field
The invention belongs to the field of air conditioners, and particularly relates to an air conditioner heat exchange device and an air conditioner.
Background
With the development of air conditioners, the multi-split air conditioner is developed in a compact mode, the refrigerating capacity/heating capacity per unit area is continuously improved, and the heat exchange area of a heat exchanger is one of key factors which restrict the performance of the unit. The heat exchanger is divided into two parts, so that the heat exchange area of the heat exchanger can be enlarged, the pressure loss of a refrigerant in the heat exchanger is reduced, and the heat exchange efficiency of the heat exchanger is improved.
Chinese patent CN107631515A, heat pump air conditioning unit, including a compressor, a four-way valve, an outdoor heat exchanger and an indoor heat exchanger, wherein a high pressure exhaust port of the compressor is connected to a first port of the four-way valve, a third port of the four-way valve is connected to fourth ports of the outdoor heat exchanger, the indoor heat exchanger and the four-way valve in sequence, and a second port of the four-way valve is connected to a low pressure suction port of the compressor, which is characterized in that: the outdoor heat exchanger comprises a first heat exchanger and a second heat exchanger which are arranged in parallel, a first electronic expansion valve is arranged between the first heat exchanger and the indoor heat exchanger, and a second electronic expansion valve is arranged between the second heat exchanger and the indoor heat exchanger.
In the above patent, only the heat exchangers of the air conditioning unit are regulated by different opening degrees of the electronic expansion valve under different working conditions, and a specific control method is not disclosed, so that the balanced and efficient heat exchange of the two heat exchangers cannot be realized.
Disclosure of Invention
The invention provides an air conditioner heat exchange device and an air conditioner for controlling a plurality of heat exchangers in a balanced and efficient manner, aiming at the technical problem that the heat exchangers of the air conditioning unit cannot be used in a balanced and efficient manner.
In order to achieve the purpose, the invention adopts the technical scheme that:
the heat exchange device of the air conditioner comprises a plurality of heat exchangers which are arranged in parallel, wherein the heat exchangers are respectively and independently provided with an electronic expansion valve which can be used for controlling the flow of a refrigerant, the heat exchange device also comprises a processor and a memory, a computer program is stored in the memory, and when the program is executed by the processor, the following steps can be realized:
collecting relevant parameters of the interior and the environment of the air conditioner, and calculating according to the parameters to obtain a correction coefficient K;
respectively detecting the related temperature of the heat exchanger and the related pressure of the compressor, comparing the detected temperature and pressure with preset values, and calculating to obtain the change amount of the opening of the electronic expansion valve;
calculating the change amount of the opening of the electronic expansion valve, the opening EVO (n) of the current electronic expansion valve and a correction coefficient to obtain a calculated value EVO (n +1), and regulating and controlling the opening of the electronic expansion valve according to the calculated value EVO (n + 1);
and entering the next control cycle, replacing the current opening EVO (n) of the electronic expansion valve with the calculated value EVO (n +1), and repeating the steps to continuously regulate and control the electronic expansion valve.
Preferably, the processor executes a program to calculate the change amount of the opening of the electronic expansion valve during cooling, and further includes the following steps:
the related temperature of the heat exchanger comprises the temperature Te of a liquid pipe of the heat exchanger, the temperature Te of the liquid pipe of the heat exchanger is detected and compared with the preset saturation temperature Tsc to obtain Te-Tsc, and a first change quantity delta EVO1 of the opening of the electronic expansion valve is calculated according to the value of the Te-Tsc;
and the related pressure of the compressor comprises a discharge pressure Pd, the discharge pressure Pd of the compressor is detected and compared with a target discharge pressure Pdc to obtain Pd-Pdc, and a second change quantity delta EVO2 of the opening of the electronic expansion valve is calculated according to the value of Pd-Pdc.
Preferably, the processor executes a program to regulate and control the opening of the electronic expansion valve according to the calculated value EVO (n +1), and the method includes the following steps:
obtaining a calculated value EVO (n +1) of the opening of the electronic expansion valve according to a formula EVO (n +1) ═ EVO (n)) + delta EVO1+ delta EVO2) multiplied by K, and comparing the calculated value EVO (n +1) with a minimum value EVOmin and a maximum value EVOmax of the opening of the electronic expansion valve;
when EVO (n +1) is not more than EVOmin, setting the opening of the electronic expansion valve as EVOmin;
when EVO (n +1) is not less than EVOmax, the opening degree of the electronic expansion valve is set to EVOmax;
when EVO (n +1) is the other value, the electronic expansion valve opening degree is set to EVO (n + 1).
Preferably, the processor executes a program to calculate the change amount of the opening of the electronic expansion valve during heating, and further includes:
the related temperature of the heat exchanger comprises the temperature Tg of a heat exchanger air pipe, the temperature Tg of the heat exchanger air pipe is detected and compared with the preset evaporation temperature Tso to obtain Tg-Tso, and a third change delta EVO3 of the opening degree of the electronic expansion valve is calculated according to the value of Te-Tsc;
the related pressure of the compressor comprises suction pressure Ps, the discharge and suction force Ps of the compressor is detected and compared with target suction pressure Psc to obtain Ps-Psc, and a fourth change delta EVO4 of the opening of the electronic expansion valve is calculated according to the value of the Ps-Psc;
and the related temperature of the heat exchanger comprises the temperature Te of a liquid pipe of the heat exchanger, the temperature Te of the liquid pipe of the heat exchanger is detected and compared with the temperature Tg of an air pipe of the heat exchanger to obtain Tg-Te, and a fifth variable delta EVO5 of the opening degree of the electronic expansion valve is calculated according to the value of the Tg-Te.
Preferably, the processor executes a program to regulate and control the opening of the electronic expansion valve according to the calculated value EVO (n +1), and the method includes the following steps:
obtaining a calculated value EVO (n +1) of the opening of the electronic expansion valve according to a formula EVO (n +1) ═ EVO (n)) + delta EVO3+ delta EVO4+ delta EVO5) multiplied by K, and comparing the calculated value EVO (n +1) with a minimum value EVOmin and a maximum value EVOmax of the opening of the electronic expansion valve;
when EVO (n +1) is not more than EVOmin, setting the opening of the electronic expansion valve as EVOmin;
when EVO (n +1) is not less than EVOmax, the opening degree of the electronic expansion valve is set to EVOmax;
when EVO (n +1) is the other value, the electronic expansion valve opening degree is set to EVO (n + 1).
Preferably, the correction coefficient K included in the processor execution program is a product of one or more of an ambient temperature correction coefficient Kta, a frequency correction coefficient Khz, and an exhaust temperature correction coefficient Ktd.
An air conditioner adopts any one of the air conditioner heat exchange device.
Compared with the prior art, the invention has the advantages and positive effects that:
the air conditioner heat exchange device is provided with two independently controlled heat exchangers, the regulation and control of the heat exchangers are realized according to the related temperature of the heat exchangers and the related pressure data of the compressor, and the balance and high efficiency of the heat exchange device are ensured. And correcting the opening of the electronic expansion valve by using correction coefficients such as an environment temperature correction coefficient, a frequency correction coefficient and the like, so as to ensure the accurate regulation and control of the heat exchanger. The air conditioner heat exchange device adopts the design of double heat exchangers connected in parallel, and under the same heat exchange power, the invention has higher heat exchange efficiency, shorter heat exchange tube length and reduced process cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of the heat exchanger of an air conditioner;
FIG. 2 is a flow chart of a procedure executed by the heat exchange device during refrigeration;
FIG. 3 is a flow chart of a heat exchange device control method in heating;
fig. 4 is a schematic diagram of the cycle principle of the air conditioning system.
In the above figures, 1 is a heat exchanger; 11 is a heat exchanger liquid pipe; 12 is a heat exchanger air pipe; 2 is an electronic expansion valve; 3 is a compressor; 4 is an oil separator; 5 is a four-way valve; 6 is a gas-liquid separator.
Detailed Description
The invention is described in detail below by way of exemplary embodiments. It should be understood, however, that elements, structures and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
A plurality of heat exchangers 1 are arranged in parallel in the air conditioner heat exchange device, and the wind field and the connecting pipeline of the heat exchangers 1 cannot be completely symmetrical, so that the heat exchange capability of each heat exchanger 1 cannot be fully exerted due to uneven heat exchange in the running process of the heat exchangers 1. The invention designs an air conditioner heat exchange device which is provided with a plurality of heat exchangers 1 connected in parallel, wherein each heat exchanger 1 is provided with an electronic expansion valve 2 and comprises a processor and a memory, and a computer program is stored in the memory and is independently controlled by the processor; the air conditioner heat exchange device designed by the invention accurately regulates and controls the opening degree of the electronic expansion valve 2(EVO) corresponding to each heat exchanger 1 according to parameters such as the environment of the air conditioner, the air conditioner state and the like, and regulates the refrigerant flow to be perfectly matched with the air conditioner state, so that each heat exchanger 1 can achieve the optimal heat exchange effect. In the embodiment shown in fig. 1 and 2, the heat exchanger 1 of the air conditioner is provided with two parallel heat exchangers, and the processor is that of an outdoor unit.
The outdoor heat exchanger 1 is a condenser during cooling, and during cooling operation, a refrigerant is compressed in the compressor 3, and a low-temperature and low-pressure refrigerant gas is compressed into high-temperature and high-pressure superheated steam and then discharged from an exhaust port of the compressor 3. Passes through the oil separator 4 and enters the condenser from the inlet of the four-way valve 5. The high-temperature and high-pressure superheated steam is cooled in the condenser, and the superheated refrigerant is converted from a gaseous state to a liquid state through the cooling and heat dissipation effect of the outdoor fan. The refrigerant liquid is throttled and depressurized by the electronic expansion valve 2, and flows into the indoor unit at low temperature and low pressure. The refrigerant liquid absorbs heat and is vaporized after passing through the indoor unit, the temperature of the ambient air temperature is reduced, and cold air is blown into the room by the indoor fan. The gasified refrigerant is returned to the outdoor unit and is communicated with the suction pipe of the compressor 3 through the four-way valve 5, so that the refrigerant gas is sucked back into the compressor 3 through the suction port of the compressor 3 and is compressed into high-temperature and high-pressure superheated steam again to maintain the refrigeration cycle. In heating, the outdoor heat exchanger 1 is an evaporator. When heating, the high-temperature high-pressure superheated steam compressed by the compressor 3 is discharged from the exhaust port of the compressor 3, flows through the oil separator 4, and is directly sent into the indoor unit through the four-way valve 5, at this time, the indoor unit plays a role in condensation, and after the superheated steam is subjected to heat dissipation of the indoor unit, the dissipated heat is blown out by the indoor fan. The superheated steam is cooled to form low-temperature high-pressure liquid, the refrigerant liquid is throttled and decompressed by the electronic expansion valve 2, and the low-temperature low-pressure refrigerant liquid flows into the outdoor heat exchanger 1. The low-temperature and low-pressure refrigerant completes the vaporization process, the refrigerant liquid absorbs a large amount of heat to the outside, and is changed into dry saturated vapor again, and the cold air is blown out of the outdoor unit by the outdoor fan. The dry saturated steam finally returns to the air suction port of the compressor 3 through the air suction pipe connected with the compressor 3, and continues the second heating cycle. Wherein, the gas-liquid separator 6 performs gas-liquid separation on the refrigerant entering and exiting the compressor.
According to the air conditioner heat exchange device, each heat exchanger 1 is used as an independent control unit, relevant parameters of the heat exchanger 1 are collected and processed, respective control programs are independently executed respectively through distinguishing parameter labels, the opening degree of the electronic expansion valve 2 is controlled, the heat exchangers 1 are in a high-efficiency heat exchange state, therefore, the optimal control of the heat exchange performance of the system is achieved, and the processor executes different programs in a storage medium under the two conditions of refrigeration and heating. During cooling, the outdoor unit processor executes the program in the storage medium, as shown in fig. 2, and implements the following steps:
and setting the range of the opening degree of the electronic expansion valve of the air conditioner, wherein the range comprises the maximum value EVOmax of the opening degree of the electronic expansion valve and the minimum value EVOmin of the opening degree of the electronic expansion valve. When the air conditioner starts to work, the opening degree of the electronic expansion valve is initialized, and the opening degree of the electronic expansion valve is EVO (n) at present.
The outdoor unit processor receives relevant parameters of the inside and the environment of the air conditioner, which are acquired by the sensors, including parameters such as the current environment temperature, the frequency of the compressor 3, the exhaust temperature of the compressor 3 and the like, and processes the parameters to obtain an environment temperature correction coefficient Kta, a frequency correction coefficient Khz and an exhaust temperature correction coefficient Ktd.
The outdoor unit processor obtains a detection result Te of the temperature of the heat exchanger liquid pipe 11, and compares the temperature Te of the heat exchanger liquid pipe 11 with a preset saturation temperature Tsc to obtain Te-Tsc. And the outdoor unit processor processes the difference Te-Tsc to obtain a first change quantity delta EVO1 of the opening degree of the electronic expansion valve. When the difference Te-Tsc is greater than 0, it indicates that the heat exchange capacity of the outdoor heat exchanger 1 is insufficient to condense the high-temperature gaseous refrigerant flowing through the heat exchanger 1 into a liquid state, and at this time, the corresponding first change amount Δ EVO1 of the opening of the electronic expansion valve is smaller than 0, so as to reduce the amount of the refrigerant flowing through the heat exchanger 1. When the difference Te-Tsc is less than 0, it is shown that the heat exchange capacity of the outdoor heat exchanger 1 can completely condense the high-temperature gaseous refrigerant flowing through the heat exchanger 1 into a liquid state, the heat exchange capacity of the heat exchanger 1 cannot be fully exerted, at this time, the corresponding first change amount Δ EVO1 of the opening of the electronic expansion valve is greater than 0, the opening of the electronic expansion valve is increased, so that the amount of the refrigerant flowing through the heat exchanger 1 is increased, and the heat exchange capacity of the heat exchanger 1 is fully exerted. When the difference Te-Tsc is equal to 0, it indicates that the heat exchange capacity of the heat exchanger 1 is just matched with the refrigerant flow, at this time, the corresponding first change Δ EVO1 of the opening degree of the electronic expansion valve is equal to 0, the opening degree of the electronic expansion valve is kept unchanged, and the current refrigerant flow is kept.
Through the control, each outdoor heat exchanger 1 can have an optimal refrigerant flow to achieve the most efficient heat exchange, but at the moment, the condensation pressure of the system also has deviation, so that the condensation temperature in the heat exchanger 1 cannot be matched with the heat exchange, and the system control parameters fluctuate, and because the condensation pressure is basically consistent with the exhaust pressure of the compressor 3, the pressure at the exhaust port of the compressor 3, namely the exhaust pressure Pd, is introduced to participate in the coordination control of the electronic expansion valve 2.
The outdoor unit processor obtains a detection result Pd of the discharge pressure of the compressor 3, and compares the discharge pressure Pd with a preset target discharge pressure Pdc to obtain Pd-Pdc. And the outdoor unit processor processes the difference Pd-Pdc to obtain a second change quantity delta EVO2 of the opening degree of the electronic expansion valve. The discharge pressure difference is provided with a plurality of intervals including Δ Pd1, Δ Pd2 and other intervals, corresponding to different states of the compressor 3, to which different changes of the opening degree of the electronic expansion valve are adapted, including A, B and 0, wherein a > B > 0. When the difference Pd-Pdc falls within the pressure range Δ Pd1, which indicates that the exhaust pressure is higher than the target pressure, the second change Δ EVO2 of the opening degree of the electronic expansion valve corresponding to the difference is a, and the opening degree of the electronic expansion valve is increased to a large extent, so that the exhaust pressure is rapidly reduced. When the difference Pd-Pdc falls within the pressure range Δ Pd2, it indicates that the exhaust pressure is lower than the target pressure, and at this time, the corresponding second change Δ EVO2 of the electronic expansion valve opening degree is B, and the electronic expansion valve opening degree increase width is smaller, and the exhaust pressure is reduced. When the difference Pd-Pdc is another value, it indicates that the exhaust pressure is still within the fitting range from the target pressure, and when the corresponding second change Δ EVO2 of the electronic expansion valve opening degree is equal to 0, the electronic expansion valve opening degree remains unchanged.
The exhaust pressure of the compressor 3 and the flow of the system refrigerant are comprehensively regulated by the electronic expansion valve 2 of the outdoor unit in cooperation with the regulation of the indoor throttling device. The condensing pressure of the system is efficiently matched with the heat exchange efficiency of the outdoor heat exchanger 1.
And on the control result, other factors which are obtained by processing the outdoor unit processor and influence outdoor heat exchange are fully introduced: and fitting a relevant correction coefficient by using the outdoor environment temperature Ta, the frequency Hz of the compressor 3 influencing the flow and the exhaust temperature Td related to the safety of the compressor 3, and performing further closed-loop automatic control correction on the integral opening degree of the electronic expansion valve 2.
The outdoor unit calculates according to the current opening degree EVO (n) of the electronic expansion valve, a first change quantity delta EVO1 of the opening degree of the electronic expansion valve, a second change quantity delta EVO2 of the opening degree of the electronic expansion valve, an environment temperature correction coefficient Kta, a frequency correction coefficient Khz and a discharge temperature correction coefficient Ktd; substituting the above parameters into the formula:
EVO(n+1)＝(EVO(n)+ΔEVO1+ΔEVO2)×Kta×Kh×Ktd
and obtaining a calculated value EVO (n +1) of the opening of the electronic expansion valve, wherein the calculated value EVO (n +1) is a theoretical optimal value of the opening of the electronic expansion valve in the current state. Since the opening degree of the electronic expansion valve can only be set in a range from EVOmin to EVOmax, the calculated value EVO (n +1) is compared with the minimum value EVOmin and the maximum value EVOmax of the opening degree of the electronic expansion valve. When EVO (n +1) is not more than EVOmin, setting the opening EVO (n) of the electronic expansion valve as EVOmin; when EVO (n +1) is not less than EVOmax, the opening EVO (n) of the electronic expansion valve is set to EVOmax; when EVO (n +1) is the other value, the electronic expansion valve opening EVO (n) is set to EVO (n + 1).
And regulating and controlling the electronic expansion valve 2 according to the updated opening EVO (n) of the electronic expansion valve to enable the refrigerant flow to be adapted to the current air-conditioning state. And substituting the updated opening EVO (n) of the electronic expansion valve into the steps to realize the continuous regulation and control of the electronic expansion valve 2, so that the heat exchange device is always in a high-efficiency operation state.
In heating, the outdoor processor executes the program in the storage medium, as shown in fig. 3, and implements the following steps:
and setting the range of the opening degree of the electronic expansion valve of the air conditioner, wherein the range comprises the maximum value EVOmax of the opening degree of the electronic expansion valve and the minimum value EVOmin of the opening degree of the electronic expansion valve. When the air conditioner starts to work, the opening degree of the electronic expansion valve is initialized, and the opening degree of the electronic expansion valve is EVO (n) at present.
The outdoor unit processor receives relevant parameters of the inside and the environment of the air conditioner, which are acquired by the sensors, including parameters such as the current environment temperature, the frequency of the compressor 3, the exhaust temperature of the compressor 3 and the like, and the outdoor unit processor processes the parameters to obtain an environment temperature correction coefficient Kta, a frequency correction coefficient Khz and an exhaust temperature correction coefficient Ktd.
In the heating process, the outdoor heat exchanger 1 is an evaporator, so that the evaporation condition of the refrigerant in the outdoor evaporator can be inferred through the change of the gaseous refrigerant Tg value at the outlet of the heat exchanger 1, whether the refrigerant flow is proper or not is judged, and when the outdoor heat exchanger 1 is completely evaporated, the Tg can directly reflect whether the outdoor evaporation temperature is proper or not. And to ensure the reliability of the compressor 3, to prevent the compressor 3 from being hydraulically compressed, a safety constant value of the superheat Tsh is added to the temperature
The outdoor unit processor obtains a detection result Tg of the temperature of the air pipe 12 of the heat exchanger, namely the gaseous refrigerant Tg at the outlet of the heat exchanger 1, and compares the Tg with the evaporation temperature Tso to obtain Tg-Tso. Wherein Tso is the actual evaporation temperature of the system operation, and can be derived from the refrigerant physical property table and the suction pressure Ps of the compressor 3 in the unit operation. And the outdoor unit processor processes the difference Tg-Tso to obtain a third change quantity delta EVO3 of the opening of the electronic expansion valve.
The specific processing procedure is that the difference Tg-Tso is compared with the degree of superheat Tsh, wherein the degree of superheat Tsh is a fixed value. When Tg-Tso < Tsh, the refrigerant state at the outlet of the heat exchanger 1 is a gas-liquid mixed state containing certain liquid, the evaporation is incomplete, the heat exchange capacity of the outdoor heat exchanger 1 cannot be met, at the moment, the corresponding third change quantity delta EVO3 of the opening of the electronic expansion valve is less than 0, and the opening of the electronic expansion valve is reduced, so that the amount of the refrigerant flowing through the heat exchanger 1 is reduced. And when Tg-Tso > Tsh, the refrigerant at the outlet of the heat exchanger 1 is in an overheated pure gas state, the refrigerant flowing through the heat exchanger 1 is completely evaporated, the outdoor heat exchanger 1 has a certain heat exchange allowance, the corresponding third change quantity delta EVO3 of the opening of the electronic expansion valve is less than 0, and the opening of the electronic expansion valve is increased, so that the amount of the refrigerant flowing through the heat exchanger 1 is increased. When the difference Tg-Tso is Tsh, it is indicated that the refrigerant flow rate is exactly adapted to the heat exchange capacity of the outdoor heat exchanger 1, at this time, the third change Δ EVO3 of the opening degree of the corresponding electronic expansion valve is 0, and the opening degree of the electronic expansion valve is unchanged, so as to maintain the refrigerant amount currently flowing through the heat exchanger 1.
Through the above-mentioned EVO control, when the outdoor heat exchanger 1 is used as an evaporator, there are also optimal heat exchange states and efficiencies, but whether the evaporation temperature of the whole system reaches the optimal evaporation temperature or not, there will also be a certain influence on the energy efficiency of the whole system and the heat exchange state of the heat exchanger 1, and therefore, the suction pressure Ps of the compressor 3 representing the evaporation temperature is introduced for coupling control.
The outdoor unit processor obtains a detection result Ps of the suction pressure of the compressor 3, and compares the suction pressure Ps with a preset target suction pressure Psc to obtain Ps-Psc. And the outdoor unit processor processes the difference value Ps-Psc to obtain a fourth change quantity delta EVO4 of the opening degree of the electronic expansion valve. The suction pressure difference is provided with a plurality of intervals including Δ Ps1, Δ Ps2 and other intervals, corresponding to different states of the compressor 3, and different changes of the opening degree of the electronic expansion valve are adapted to the intervals including C, S and 0, wherein C > S > 0. When the difference Ps-Psc falls within the pressure range Δ Ps1, the intake pressure is much lower than the target pressure, and at this time, the fourth change Δ EVO4 of the opening degree of the electronic expansion valve corresponding to this change Δ EVO 3578 is equal to C, and the opening degree of the electronic expansion valve is increased to a large extent, thereby rapidly increasing the intake pressure. When the difference Ps-Psc falls within the pressure range Δ Ps2, it indicates that the intake pressure is lower than the target pressure, and the fourth change Δ EVO2 of the opening degree of the electronic expansion valve is equal to D, and the opening degree of the electronic expansion valve is increased by a small amount, thereby increasing the intake pressure. When the difference Ps-Psc is another value, it indicates that the intake pressure is still within the fitting range from the target pressure, and the corresponding fourth change Δ EVO4 of the electronic expansion valve opening degree is 0, and the electronic expansion valve opening degree remains unchanged.
Because the working conditions are changeable and the pressure change and temperature detection have deviation, the temperature difference of a gas-liquid pipe is introduced to properly supplement and judge the flow of the whole refrigerant and further protect the compressor 3 from being impacted by liquid. Since the inlet of the evaporator is a gas-liquid mixed refrigerant, and the temperature of the refrigerant is equal to the evaporation temperature of the refrigerant at the pressure, the determination is made by the difference between the outlet gas pipe temperature Te and the inlet gas pipe temperature Tg.
And the outdoor unit processor compares the temperature Tg of the air pipe 12 of the heat exchanger with the temperature Te of the liquid pipe 11 of the heat exchanger to obtain Tg-Te. And the outdoor unit processor processes the difference Tg-Te to obtain a fifth change delta EVO5 of the opening degree of the electronic expansion valve. When the difference Tg-Te is less than 0, the refrigerant flow is seriously excessive, and at the moment, the corresponding fifth change quantity delta EVO5 of the opening of the electronic expansion valve is less than 0, so that the opening of the electronic expansion valve is reduced, and the refrigerant flow is reduced. When the difference Tg-Te is greater than or equal to 0, it indicates that the refrigerant flow is still within the controllable range, and the opening correction is not needed, at this time, the fifth change Δ EVO5 of the corresponding electronic expansion valve opening is 0, the electronic expansion valve opening is unchanged, and the current refrigerant flow is maintained.
The outdoor unit calculates according to the current opening degree EVO (n) of the electronic expansion valve, a third change amount delta EVO3 of the opening degree of the electronic expansion valve, a fourth change amount delta EVO4 of the opening degree of the electronic expansion valve, a fifth change amount delta EVO5 of the opening degree of the electronic expansion valve, an ambient temperature correction coefficient Kta, a frequency correction coefficient Khz and a discharge temperature correction coefficient Ktd; substituting the above parameters into the formula:
EVO(n+1)＝(EVO(n)+ΔEVO3+ΔEVO4+ΔEVO5)×Kta×Kh×Ktd
and obtaining a calculated value EVO (n +1) of the opening of the electronic expansion valve, wherein the calculated value EVO (n +1) is a theoretical optimal value of the opening of the electronic expansion valve in the current state. Since the opening degree of the electronic expansion valve can only be set in a range from EVOmin to EVOmax, the calculated value EVO (n +1) is compared with the minimum value EVOmin and the maximum value EVOmax of the opening degree of the electronic expansion valve. When EVO (n +1) is not more than EVOmin, setting the opening EVO (n) of the electronic expansion valve as EVOmin; when EVO (n +1) is not less than EVOmax, the opening EVO (n) of the electronic expansion valve is set to EVOmax; when EVO (n +1) is the other value, the electronic expansion valve opening EVO (n) is set to EVO (n + 1).
And regulating and controlling the electronic expansion valve 2 according to the updated opening EVO (n) of the electronic expansion valve to enable the refrigerant flow to be adapted to the current air-conditioning state. And substituting the updated opening EVO (n) of the electronic expansion valve into the steps to realize the continuous regulation and control of the electronic expansion valve 2, so that the heat exchange device is always in a high-efficiency operation state.
The air conditioner heat exchange device adopts the design of double heat exchangers connected in parallel, and has higher heat exchange efficiency and shorter heat exchange tube length under the same heat exchange power. The factors affecting the pressure loss are mainly the flow rate and the pipe length, while the flow rate is related to the flow rate, i.e. the factors affecting the pressure loss are mainly the flow rate and the pipe length. The pressure loss is proportional to the square of the flow and proportional to the tube length. When two parallel heat exchangers 1 are designed, the pipe length of a single heat exchanger 1 is assumed to be l, and the flow rate is assumed to be q; the integral heat exchanger 1 welded together by the two heat exchangers 1 is adopted, and the two independent heat exchangers 1 are connected in parallel, so the tube length of each heat exchanger 1 is 1/2l, and the flow is 1/2q, so the pressure loss of each heat exchanger 1 is one eighth of that of a single heat exchanger 1, the pressure loss is greatly reduced, the heat exchange efficiency of the heat exchanger 1 can be improved, and meanwhile, the unit performance can also be improved.
The opening degree of the electronic expansion valve 2 corresponding to each heat exchanger 1 is controlled by adopting the control method of the air conditioner heat exchange device, the opening degree of the electronic expansion valve 2 corresponding to each heat exchanger 1 can be accurately regulated according to parameters such as the environment where the air conditioner is located, the air conditioner state and the like, the refrigerant flow is regulated to be perfectly matched with the air conditioner state, and the heat exchanger 1 can achieve the best heat exchange effect. The air conditioner heat exchange device can effectively avoid the problems of unbalanced heat exchange capacity and difficult high-efficiency operation among the heat exchangers 1 caused by incomplete symmetry of the wind field of the heat exchangers 1 and the connecting pipelines.
The invention also comprises an air conditioner, and the heat exchange device is adopted, so that the heat exchange efficiency can be effectively improved, and the cost can be reduced.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. The utility model provides an air conditioner heat transfer device, includes a plurality of heat exchangers of parallelly connected setting, its characterized in that: the heat exchangers are respectively and independently provided with an electronic expansion valve which can be used for controlling the flow of a refrigerant, and the heat exchanger further comprises a processor and a memory, wherein a computer program is stored in the memory, and when the program is executed by the processor, the following steps can be realized:
collecting relevant parameters of the interior and the environment of the air conditioner, and calculating according to the parameters to obtain a correction coefficient K; the relevant parameters of the interior and the environment of the air conditioner comprise one or more of the current environment temperature, the compressor frequency and the compressor exhaust temperature;
respectively detecting the related temperature of the heat exchanger and the related pressure of the compressor, comparing the detected temperature and pressure with preset values, and calculating to obtain the change amount of the opening of the electronic expansion valve;
during refrigeration, the related temperature of the heat exchanger comprises the temperature Te of a liquid pipe of the heat exchanger, and the related pressure of the compressor comprises the exhaust pressure Pd;
during heating, the related temperature of the heat exchanger comprises the temperature Tg of a gas pipe of the heat exchanger and the temperature Te of a liquid pipe of the heat exchanger, and the related pressure of the compressor comprises the suction pressure Ps;
calculating the change amount of the opening of the electronic expansion valve, the opening EVO (n) of the current electronic expansion valve and a correction coefficient to obtain a calculated value EVO (n +1), and regulating and controlling the opening of the electronic expansion valve according to the calculated value EVO (n + 1);
and entering the next control cycle, replacing the current opening EVO (n) of the electronic expansion valve with the calculated value EVO (n +1), and repeating the steps to continuously regulate and control the electronic expansion valve.
2. The heat exchange device of an air conditioner according to claim 1, wherein the processor executes a program to calculate the change of the opening of the electronic expansion valve, and further comprising the following steps: during refrigeration, detecting the temperature Te of a liquid pipe of the heat exchanger, comparing the temperature Te with a preset saturation temperature Tsc to obtain Te-Tsc, and calculating a first change delta EVO1 of the opening of the electronic expansion valve according to the value of the Te-Tsc;
and detecting the compressor discharge pressure Pd, comparing the detected pressure Pd with the target discharge pressure Pdc to obtain Pd-Pdc, and calculating a second change quantity delta EVO2 of the opening degree of the electronic expansion valve according to the value of Pd-Pdc.
3. An air conditioner heat exchange device according to claim 2, wherein the processor executes a program to regulate and control the opening of the electronic expansion valve according to the calculated value EVO (n +1), and the method comprises the following steps:
obtaining a calculated value EVO (n +1) of the opening of the electronic expansion valve according to a formula EVO (n +1) ═ EVO (n)) + delta EVO1+ delta EVO2) multiplied by K, and comparing the calculated value EVO (n +1) with a minimum value EVOmin and a maximum value EVOmax of the opening of the electronic expansion valve;
when EVO (n +1) is not more than EVOmin, setting the opening of the electronic expansion valve as EVOmin;
when EVO (n +1) is not less than EVOmax, the opening degree of the electronic expansion valve is set to EVOmax;
when EVO (n +1) is the other value, the electronic expansion valve opening degree is set to EVO (n + 1).
4. The heat exchange device of an air conditioner according to claim 1, wherein the processor executes a program to calculate the change of the opening of the electronic expansion valve, and further comprising the following steps: during heating, detecting the temperature Tg of a heat exchanger air pipe, comparing the temperature Tg with a preset evaporation temperature Tso to obtain Tg-Tso, and calculating a third change delta EVO3 of the opening of the electronic expansion valve according to the value of Te-Tsc;
detecting the discharge and suction force Ps of the compressor, comparing the discharge and suction force Ps with the target suction pressure Psc to obtain Ps-Psc, and calculating a fourth change delta EVO4 of the opening of the electronic expansion valve according to the value of the Ps-Psc;
and detecting the temperature Te of the liquid pipe of the heat exchanger, comparing the temperature Te with the temperature Tg of the air pipe of the heat exchanger to obtain Tg-Te, and calculating a fifth variable delta EVO5 of the opening degree of the electronic expansion valve according to the value of the Tg-Te.
5. An air conditioner heat exchange device according to claim 4, wherein the processor executes a program to regulate and control the opening of the electronic expansion valve according to the calculated value EVO (n +1), and the method comprises the following steps:
obtaining a calculated value EVO (n +1) of the opening of the electronic expansion valve according to a formula EVO (n +1) ═ EVO (n)) + delta EVO3+ delta EVO4+ delta EVO5) multiplied by K, and comparing the calculated value EVO (n +1) with a minimum value EVOmin and a maximum value EVOmax of the opening of the electronic expansion valve;
when EVO (n +1) is not more than EVOmin, setting the opening of the electronic expansion valve as EVOmin;
when EVO (n +1) is not less than EVOmax, the opening degree of the electronic expansion valve is set to EVOmax;
when EVO (n +1) is the other value, the electronic expansion valve opening degree is set to EVO (n + 1).
6. The heat exchange device of an air conditioner as claimed in claim 1, characterized in that: the processor executes the program to include a correction coefficient K that is a product of one or more of an ambient temperature correction coefficient Kta, a frequency correction coefficient Khz, and an exhaust temperature correction coefficient Ktd.
7. An air conditioner, characterized in that: the heat exchange device of the air conditioner as claimed in any one of claims 1 to 6 is adopted.
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