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WO2019052541A1 - Procédé et dispositif de commande de réfrigération de climatiseur à fréquence variable - Google Patents

Procédé et dispositif de commande de réfrigération de climatiseur à fréquence variable Download PDF

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Publication number
WO2019052541A1
WO2019052541A1 PCT/CN2018/105789 CN2018105789W WO2019052541A1 WO 2019052541 A1 WO2019052541 A1 WO 2019052541A1 CN 2018105789 W CN2018105789 W CN 2018105789W WO 2019052541 A1 WO2019052541 A1 WO 2019052541A1
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WIPO (PCT)
Prior art keywords
fans
air conditioner
evaporators
compressor
control method
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2018/105789
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English (en)
Chinese (zh)
Inventor
刘卫兵
吴洪金
耿宝寒
朱辉
刘庆赟
贾淑玲
杜路明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qingdao Haier Air Conditioner Gen Corp Ltd
Original Assignee
Qingdao Haier Air Conditioner Gen Corp Ltd
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Filing date
Publication date
Application filed by Qingdao Haier Air Conditioner Gen Corp Ltd filed Critical Qingdao Haier Air Conditioner Gen Corp Ltd
Publication of WO2019052541A1 publication Critical patent/WO2019052541A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements

Definitions

  • the invention relates to the technical field of refrigeration, and in particular relates to a cooling control method and device for an inverter air conditioner.
  • the inverter air conditioner usually calculates the real-time running frequency of the compressor according to the indoor target temperature set by the remote controller, the indoor ambient temperature, and the outdoor ambient temperature.
  • some air conditioner indoor units are currently provided with two evaporators in parallel and two fans to achieve multiple modes of air supply. Therefore, it is often the case that only one fan is turned on.
  • the evaporator part corresponding to the unopened fan is forced to convectively exchange heat with the fan, which makes the heat transfer unfavorable, which will result in a lower coil temperature, and the evaporator will freeze at an extreme temperature. Therefore, how to accurately control the operating frequency of the compressor, so that the air conditioner not only meets the cooling demand, but also avoids the freezing of the evaporator, has become an urgent problem to be solved.
  • An object of the present invention is to overcome the above-mentioned deficiencies of the prior art, and to provide a refrigeration control method and apparatus for an inverter air conditioner, which realizes precise control of the operating frequency of the compressor, so that the air conditioner can meet the cooling demand and avoid the evaporator. A freeze has occurred.
  • a further object of the present invention is to improve the intelligence of the air supply of the air conditioner, to achieve on-demand air supply and gentle air supply, and to enhance user comfort.
  • the present invention provides a cooling control method for an inverter air conditioner, wherein the indoor unit of the air conditioner includes two evaporators arranged in parallel, two fans respectively corresponding to the two evaporators, and each of the fans corresponds to at least one air outlet.
  • Refrigeration control methods include:
  • the indoor target temperature Ta, the indoor ambient temperature Tb, the outdoor ambient temperature Tc, and the coil temperatures of the two evaporators are detected, and the lower temperature values of the two coil temperatures are recorded as Td;
  • the operating frequency of the compressor is determined according to the temperature difference range of Tb-Ta and the values of Ta, Tb, and Tc.
  • Td ⁇ T1 the compressor is controlled to be down-converted so that its frequency f ⁇ f (Ta1, Tb1, Tc1).
  • T1 0 ° C
  • T2 4 ° C
  • T3 7 ° C
  • T4 13 ° C
  • the air conditioner comprises a compressor, a condenser, a tee, a first electronic expansion valve and a second electronic expansion valve, and two evaporators; wherein the inlet of the tee is connected to the outlet of the condenser, the tee Two outlets respectively communicate with the inlets of the first electronic expansion valve and the second electronic expansion valve; the outlets of the first electronic expansion valve and the second electronic expansion valve respectively communicate with the inlets of the two evaporators; and the two evaporator outlets are respectively connected and compressed Import of the machine.
  • each air outlet is provided with: a vertical swinging leaf group, comprising a plurality of vertical pendulum leaves extending vertically and installed at the air outlet, the plurality of vertical swinging leaves being synchronously pivoted to adjust the left and right winds And a yaw group comprising a plurality of yaw leaves extending horizontally, which are mounted behind the vertical pendulum, and the plurality of yaw blades are pivoted synchronously to adjust the up and down direction of the wind.
  • a vertical swinging leaf group comprising a plurality of vertical pendulum leaves extending vertically and installed at the air outlet, the plurality of vertical swinging leaves being synchronously pivoted to adjust the left and right winds
  • a yaw group comprising a plurality of yaw leaves extending horizontally, which are mounted behind the vertical pendulum, and the plurality of yaw blades are pivoted synchronously to adjust the up and down direction of the wind.
  • one fan corresponds to two air outlets, and the other fan corresponds to one air outlet; and three air outlets are arranged in a straight line.
  • both fans are cross-flow fans.
  • both evaporators are finned evaporators and share the same set of fins, the coils of the two evaporators respectively matching the two halves of the set of fins.
  • a refrigeration control apparatus for an inverter air conditioner, comprising a memory and a processor, wherein the memory stores therein a control program for implementing the frequency conversion of any of the above when the control program is executed by the processor Air conditioning refrigeration control method.
  • the compressor frequency is corrected according to the coil temperature of the evaporator.
  • the operating frequency is normally calculated according to the above function; when the coil temperature satisfies T1 ⁇ Td ⁇ T2, it is maintained Run at a fixed frequency to avoid further reduction in coil temperature.
  • the compressor When the coil temperature Td ⁇ T1, the compressor is controlled to reduce the frequency, and the coil temperature of the evaporator is raised to prevent it from continuing to cool down and cause freezing.
  • the correction coefficient b of less than 1 is calculated according to the temperature difference Tb-Ta, the operating frequency of the compressor is reduced, and the evaporation temperature is raised. Avoid freezing the evaporator. It can be seen from the above that the present invention precisely controls the operating frequency of the compressor so that the air conditioner can satisfy both the cooling demand and the evaporator freezing.
  • the air conditioner indoor unit is provided with two evaporators, two fans and a plurality of air outlets, which can adjust the number of fan opening, the wind speed and the refrigerant flow rate of the evaporator according to the cooling demand of the user, and realize the intelligent adjustment of the air volume and the cooling capacity.
  • the air volume and cooling capacity are more closely matched to the indoor demand, which saves energy consumption of the air conditioner.
  • FIG. 1 is a schematic structural view of a portion of an indoor unit of an air conditioner according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a refrigeration cycle of the air conditioning indoor unit shown in FIG. 1;
  • Figure 3 is an exploded perspective view showing the air blowing structure of the air conditioning indoor unit shown in Figure 1;
  • FIG. 4 is a schematic structural view of an evaporator of an air conditioning indoor unit according to an embodiment of the present invention.
  • Figure 5 is a schematic view showing a cooling control method of an air conditioner according to an embodiment of the present invention.
  • FIG. 6 is a flow chart showing a cooling control method of an air conditioner according to an embodiment of the present invention.
  • Figure 7 is a schematic block diagram of a refrigeration control apparatus for an inverter air conditioner according to an embodiment of the present invention.
  • Embodiments of the present invention provide a cooling control method for an inverter air conditioner.
  • 1 is a schematic structural view of an air conditioner indoor unit according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a refrigeration cycle of the air conditioner indoor unit shown in FIG. 1
  • FIG. 3 is an exploded perspective view of the air supply structure of the air conditioner indoor unit shown in FIG. 4
  • Figure 2 only illustrates several major components of the refrigeration cycle system, and Figure 4 separates the two evaporators by dashed lines.
  • the indoor unit of the inverter air conditioner includes a casing, two evaporators 551, 552, two fans 410, 420, a plurality of air outlets 112, 114, 116, and a plurality of swinging blade assemblies.
  • the evaporator 551, the fan 410 and the air outlets 112, 114 are matched.
  • the evaporator 552, the fan 420 and the air outlet 116 are matched. 1 shows only the front panel 110 of the housing.
  • the front panel 110 is provided with the aforementioned air outlets 112, 114, 116, and the rear side of the housing is not shown with an air inlet.
  • the outdoor air enters the casing from the air inlet, passes through two evaporators 551, 552 driven by the fan, and exchanges heat with the evaporators 551, 552, and then blows into the room from the corresponding air outlets 112, 114, 116 to achieve cooling/heating of the indoor environment.
  • the air outlet areas of the three air outlets 112, 114, 116 can be set to be the same, and the number of air outlets matched by the evaporator 551 and the fan 410 is large, and the heat exchange capacity of the evaporator 551 is The air blowing capability of the fan 410 is greater than that of the evaporator 552 and the fan 420.
  • the two evaporators 551, 552 can be used in the same heat exchange condition, the heat exchange amount of the evaporator 551 is twice that of the evaporator 552, so that the two fans are at the same speed, and the air volume of the fan 410 is the fan 420. Twice.
  • the two fans 410, 420 may both be cross-flow fans.
  • the motor 411 of the fan 410 may be located at the top thereof, and the motor 421 of the fan 420 is located at the bottom thereof.
  • a bearing may be disposed between the two fans 410, 420.
  • a plurality of swinging blade assemblies (eg, a plurality of yaw lobes 312 at the air outlet 112 and a plurality of yaw blades 322 forming a swinging leaf assembly) are matched with the plurality of air outlets 112, 114, 116 for adjusting each air outlet wind direction.
  • the air conditioning indoor unit may further include a duct assembly that is erected between the fan 410, the fan 420 and the front panel 110, and includes a housing 120 and a plurality of partitions 121 defining a wind guide chamber that is open at the front and the rear.
  • a plurality of partitions are vertically arranged in the outer casing to separate the air guiding chambers from the plurality of air passages 123, 124, 125 isolated from each other, each air passage matching an air outlet for guiding the wind of the wind turbine to the air duct
  • the air outlets and the winds flowing to the plurality of air outlets 112, 114, 116 do not interfere with each other.
  • each pendulum assembly includes a pendulum group and a yaw group.
  • the vertical pendulum group includes a plurality of vertical pendulum leaves 312, 314, 316 extending vertically and installed at the air outlets 112, 114, 116, and the plurality of vertical pendulum leaves can be synchronously pivoted to adjust the left and right direction of the wind.
  • the yaw group includes a plurality of yaw leaves 324, 324, 326 extending horizontally, which are mounted in the air ducts 123, 124, 125, and the plurality of yaw leaves are pivotally synchronized to adjust the up and down direction of the wind.
  • a motor to drive a yaw leaf (or vertical pendulum) to rotate, a hinge to the yaw leaf (or vertical pendulum) and the rest of the yaw leaf (or vertical pendulum) to achieve full horizontal Synchronous pivoting of the pendulum (or vertical pendulum).
  • the yaw leaf can also be placed at the air outlet, and the vertical swing leaf can be placed in the air duct.
  • the air conditioner includes a compressor 510, a condenser 520, a three-way pipe 530, two electronic expansion valves 541, 542, and two evaporators 551, 552, wherein the inlet of the three-way pipe 530 is connected to the outlet of the condenser 520.
  • the two outlets of the tee 530 communicate with the inlets of the two electronic expansion valves 541, 542, respectively.
  • the outlets of the two electronic expansion valves 541, 542 communicate with the inlets of the evaporator 551 and the evaporator 552, respectively.
  • the evaporator 551 and the outlet of the evaporator 552 communicate with the inlet of the compressor 510.
  • the throttle element 541 is provided with a liquid separator 561, and the electronic expansion valve 542 is provided with a liquid separator 562, which is used to divide the refrigerant into multiple channels to improve the heat exchange efficiency of the evaporator.
  • the refrigerant After flowing through the coils of the two evaporators, the refrigerant merges into the header 580 and flows from the collector 580 to the compressor 510.
  • the evaporator 551 and the evaporator 552 are finned evaporators, and the two evaporators 551, 552 share the same fin set 501, and the coil 502 of the evaporator 551 is mounted on the fins.
  • the upper portion of the group 501, the coil 503 of the evaporator 552 is attached to the lower portion of the fin group 501.
  • the embodiment can facilitate the manufacture and installation of the evaporators 551, 552, and also save the internal space of the casing.
  • the internal refrigerant of the evaporator In the process of inverter air conditioner refrigeration, the internal refrigerant of the evaporator is in a low temperature and low pressure state. If it cannot exchange heat with the air in time (ie, the evaporator coil absorbs heat), it will cause condensation, frost and even freezing on the surface of the evaporator, which in turn will affect The heat exchange efficiency of the evaporator. For this reason, the refrigeration control method of the embodiment of the present invention prevents the evaporator from freezing at a low temperature by the following steps, and lowering the compressor frequency at an appropriate timing can raise the evaporation temperature.
  • Fig. 5 is a schematic view showing a cooling control method of an air conditioner according to an embodiment of the present invention. As shown in FIG. 5, the refrigeration control method of the present invention may include the following steps:
  • Step S502 when the air conditioner is operating in the cooling mode, detecting the indoor target temperature Ta (set by the user), the indoor ambient temperature Tb, the outdoor ambient temperature Tc, and the coil temperature of the two evaporators 551, 552, which are lower in the two coil temperatures.
  • the temperature value is recorded as Td.
  • the above temperature can be detected by a temperature sensor.
  • Step S504 detecting the on state of the two fans 410, 420, that is, determining that the air conditioner indoor unit has turned on several fans. If both fans 410, 420 are turned on, step S506 is performed. If only one fan is turned on, step S508 is performed.
  • step S506 the operating frequency of the compressor 510 is determined according to the temperature range in which Td is located and the values of Ta, Tb, and Tc.
  • Step S508 determining the operating frequency of the compressor 510 according to the temperature difference range in which the Tb-Ta is located and the values of Ta, Tb, and Tc.
  • Fig. 6 is a flow chart showing a cooling control method of an air conditioner according to an embodiment of the present invention.
  • the air conditioner is in a cooling mode and can be controlled using the following steps.
  • Step S601 when the air conditioner is operating in the cooling mode, detecting the indoor target temperature Ta (set by the user), the indoor ambient temperature Tb, the outdoor ambient temperature Tc, and the coil temperatures of the two evaporators 551, 552, which are lower in the two coil temperatures.
  • the temperature value is Td.
  • Step S602 detecting the on state of the two fans 410, 420, that is, determining that the air conditioner indoor unit has turned on several fans. If both of the fans 410, 420 are turned on, step S604 is performed. If only one fan is turned on, step S609 is performed.
  • step S604 it is determined whether Td>T2 is established. If yes, step S605 is performed, and if not, step S606 is performed.
  • step S605 Td>T2 is established.
  • the basic idea is to increase the frequency f of the compressor 510 as the temperature difference between Tb and Ta increases, and increase as the Tc increases.
  • the specific calculation method is the same as the calculation method of the compressor frequency in which only one fan and one evaporator are set in the prior art, and will not be described in detail herein.
  • step S606 it is determined whether T1 ⁇ Td ⁇ T2 is satisfied. If yes, step S607 is executed, and if not, step S608 is not established.
  • step S607 T1 ⁇ Td ⁇ T2 is established.
  • step S608 T1 ⁇ Td ⁇ T2 is not established, that is, Td ⁇ T1 is established.
  • the compressor 510 is controlled to operate down frequency such that its frequency f ⁇ f (Ta1, Tb1, Tc1). Therefore, when Td ⁇ T1, the coil temperature is already too low, and in order to avoid further decrease in evaporation pressure and evaporation temperature, the compressor 510 needs to be down-converted as soon as possible.
  • both of the evaporators 551, 552 can obtain good heat exchange.
  • the frequency of the compressor 510 is corrected based on the coil temperature of the evaporators 551, 552 so that the air conditioner satisfies both the cooling demand and the evaporator 551, 552 from freezing.
  • the value of b can be determined according to the temperature interval in which Tb-Ta is located.
  • T3 7 ° C
  • T4 13 ° C
  • b1 0.5
  • b2 0.8
  • b3 0.9.
  • the above embodiment when only one fan is operated, in order to prevent the heat of the evaporator portion not covered by the wind of the fan from being unfavorably caused to cause the temperature to be too low, the above embodiment reduces the operating frequency of the compressor 510 by making b ⁇ 1, Avoid low temperature freezing of this part of the evaporator.
  • FIG. 7 is a schematic block diagram of a refrigeration control apparatus for an inverter air conditioner according to an embodiment of the present invention.
  • the control device 15 of the present embodiment may include a memory 151 and a processor 153, wherein the memory 151 stores therein a control program 152 for performing refrigeration control of the inverter air conditioner of any of the above embodiments when executed by the processor 153. method.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

La présente invention concerne un procédé et un dispositif de commande de réfrigération d'un climatiseur à fréquence variable. Une unité intérieure du climatiseur comprend deux évaporateurs (551, 552) connectés en parallèle, deux ventilateurs (410, 420) correspondant aux deux évaporateurs (551, 552), et deux groupes de sortie d'air correspondant respectivement aux deux ventilateurs (410, 420). Chaque groupe de sortie d'air comprend au moins une sortie d'air (112, 114, 116). Le procédé de commande de réfrigération comprend : lorsqu'un climatiseur fonctionne en mode réfrigération, détecter une température cible intérieure Ta, une température ambiante intérieure Tb, une température ambiante extérieure Tc et les températures des tuyaux hélicoïdaux (502, 503) de deux évaporateurs (551, 552), une valeur de température inférieure dans les températures des deux tuyaux hélicoïdaux (502, 503) étant Td ; détecter l'état de marche ou d'arrêt des deux ventilateurs (410, 420) ; si les deux ventilateurs (410, 420) sont tous les deux allumés, déterminer les fréquences de fonctionnement des compresseurs (510) en fonction de la plage de température de Td et de valeurs de Ta, Tb et Tc ; et si seul un ventilateur (410, 420) est en marche, déterminer des fréquences de fonctionnement des compresseurs (510) en fonction d'une plage de différence de température Tb-Ta et des valeurs de Ta, Tb et Tc. Au moyen du procédé, les fréquences de fonctionnement des compresseurs (510) sont commandées avec précision, de telle sorte que le climatiseur peut satisfaire aux exigences de réfrigération, et la formation de gel sur les évaporateurs (551, 552) peut être empêchée.
PCT/CN2018/105789 2017-09-18 2018-09-14 Procédé et dispositif de commande de réfrigération de climatiseur à fréquence variable Ceased WO2019052541A1 (fr)

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CN201710840199.2A CN107781945B (zh) 2017-09-18 2017-09-18 变频空调的制冷控制方法
CN201710840199.2 2017-09-18

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CN107781946B (zh) * 2017-09-18 2019-12-31 青岛海尔空调器有限总公司 变频空调的制热控制方法
CN107781945B (zh) * 2017-09-18 2019-05-31 青岛海尔空调器有限总公司 变频空调的制冷控制方法
CN110873435B (zh) * 2018-08-31 2021-12-28 青岛海尔空调电子有限公司 空调室内机防结霜控制方法
CN111189180B (zh) * 2018-11-14 2021-09-21 重庆海尔空调器有限公司 一种空调及其防冻结的控制方法
CN111189196B (zh) * 2018-11-14 2021-10-29 青岛海尔空调器有限总公司 一种空调及其防冻结的控制方法
CN111189193B (zh) * 2018-11-14 2021-09-21 重庆海尔空调器有限公司 一种空调及其防冻结的控制方法
CN111189197B (zh) * 2018-11-14 2021-09-21 重庆海尔空调器有限公司 一种空调及其防冻结的控制方法
CN110017542A (zh) * 2019-04-17 2019-07-16 广东美的制冷设备有限公司 空调器、防冻结控制方法和计算机可读存储介质
CN110017587B (zh) * 2019-04-17 2021-09-28 广东美的制冷设备有限公司 运行控制方法、装置、空调器和计算机可读存储介质
CN114216237A (zh) * 2021-11-12 2022-03-22 青岛海尔空调器有限总公司 用于空调的控制方法
CN114543297A (zh) * 2022-01-17 2022-05-27 青岛海尔空调器有限总公司 用于空调器的控制方法及空调器

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