CN115717761B - Comfortable air control method for multi-split air conditioner - Google Patents
Comfortable air control method for multi-split air conditioner Download PDFInfo
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- CN115717761B CN115717761B CN202211421217.0A CN202211421217A CN115717761B CN 115717761 B CN115717761 B CN 115717761B CN 202211421217 A CN202211421217 A CN 202211421217A CN 115717761 B CN115717761 B CN 115717761B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention discloses a comfortable air control method of a multi-split air conditioner, which is characterized in that indoor units meeting the entering conditions are controlled in a refrigerating comfortable air mode, low-pressure target pressure is regulated according to different entering conditions, the middle temperature of any flow path of the indoor unit heat exchange is detected every certain time, if the continuous A time of the middle temperature of any flow path of the indoor unit heat exchange is lower than 14 ℃, the superheat degree is 1 ℃ on the basis of the existing superheat degree, if the continuous A time of the middle temperature of any flow path of the indoor unit heat exchange is higher than 16 ℃, the superheat degree is reduced by 1 ℃ on the basis of the existing superheat degree, and if the middle temperature of any flow path of the indoor unit heat exchange is continuously 14-16 ℃, the superheat degree is kept unchanged. Under the refrigeration working condition, the multi-split air conditioner has different starting capacities and temperature control under different starting modes, so that the user who needs comfortable air can be satisfied, and the user who needs rapid refrigeration can also be satisfied.
Description
Technical Field
The invention relates to the technical field of multi-split air conditioners, in particular to a comfortable air control method of a multi-split air conditioner.
Background
At present, most multi-split air conditioners perform corresponding control in the aspect of rapid refrigeration, and independent control among different indoor units cannot be performed, so that the requirements of different users on refrigeration cannot be met. Most of the existing multi-split air conditioners are low in temperature control and comfort due to large air output and low temperature control during rapid refrigeration, so that the user experience effect is poor.
Disclosure of Invention
The invention provides a comfortable air control method of a multi-split air conditioner, which aims to solve the problem that the comfortable air can not be independently controlled among different internal machines of the existing multi-split air conditioner.
The invention provides a comfortable air control method of a multi-split air conditioner, which is characterized in that indoor units meeting the entering conditions are controlled in a refrigerating comfortable air mode, low-pressure target pressure is regulated according to different entering conditions, the middle temperature of any flow path of the indoor unit heat exchange is detected every certain time, if the continuous A time of the middle temperature of any flow path of the indoor unit heat exchange is lower than 14 ℃, the superheat degree is 1 ℃ on the basis of the existing superheat degree, if the continuous A time of the middle temperature of any flow path of the indoor unit heat exchange is higher than 16 ℃, the superheat degree is reduced by 1 ℃ on the basis of the existing superheat degree, if the middle temperature of any flow path of the indoor unit heat exchange is continuously 14-16 ℃, the superheat degree is kept unchanged, the initial set value of the superheat degree is 4 ℃, and the superheat degree is at the lowest 3 ℃ and at the highest 6 ℃.
Preferably, the entry conditions are four, respectively:
entry condition (1): the sum of the rated refrigerating capacity of the refrigerating comfortable wind mode starting internal machine and the rated refrigerating capacity of the normal refrigerating mode starting internal machine is less than 50% of the refrigerating capacity of the outdoor machine;
entry condition (2): meanwhile, the rated refrigerating capacity of the indoor unit is less than 50% of the refrigerating capacity of the outdoor unit when the indoor unit is started in a refrigerating comfortable wind mode (2.1); (2.2) the difference value between the temperature of the return air inlet of all the startup internal machines and the set target temperature is not more than 1 ℃;
entry condition (3): the sum of the rated refrigerating capacity of the internal machine in the refrigeration comfortable wind mode startup and the rated refrigerating capacity of the internal machine in the normal refrigeration mode startup is more than or equal to 50% of the refrigerating capacity of the outdoor machine;
entry condition (4): meanwhile, the rated refrigerating capacity of the indoor unit is more than or equal to 50% of the refrigerating capacity of the outdoor unit when the indoor unit is started in a refrigerating comfortable wind mode (4.1); (4.2) the difference value between the temperature of all the return air inlets of the startup internal machine and the set target temperature is not more than 1 ℃.
Preferably, the air conditioner satisfying the entry condition (1) and the entry condition (3) has a low pressure target pressure of 0.75Mpa.
Preferably, the entering condition (2) is satisfied, the low-pressure target pressure is adjusted through the wind speed, if the wind speed is high wind, the low-pressure target pressure is 0.98Mpa, if the wind speed is middle wind, the low-pressure target pressure is 1Mpa, and if the wind speed is low wind, the low-pressure target pressure is 1.02Mpa; for indoor units with different capacities, the rotating speed range of the low wind speed indoor unit is 345-370rpm, the rotating speed range of the medium wind speed indoor unit is 390-400rpm, and the rotating speed range of the high wind speed indoor unit is 435-450rpm.
Preferably, the entering condition (4) is satisfied, the low-pressure target pressure is adjusted through the wind speed, if the wind speed is high wind, the low-pressure target pressure is 0.96Mpa, if the wind speed is middle wind, the low-pressure target pressure is 0.98Mpa, and if the wind speed is low wind, the low-pressure target pressure is 1Mpa; for indoor units with different capacities, the rotating speed range of the low wind speed indoor unit is 345-370rpm, the rotating speed range of the medium wind speed indoor unit is 390-400rpm, and the rotating speed range of the high wind speed indoor unit is 435-450rpm.
Preferably, if the wind speeds of the startup internal engines are different, the control is performed according to the low-pressure target pressure value corresponding to the lowest wind speed.
Preferably, if the temperature of the middle part of any flow path of the heat exchange of the indoor unit or the temperature of the heat exchange inlet of the indoor unit reaches the freezing prevention temperature, the superheat degree is immediately adjusted to be 4 ℃.
Preferably, the exit condition of the cooling comfortable wind mode is that if the difference between the temperature of the return air inlet and the set target temperature is greater than 2 ℃ in the cooling comfortable wind mode, the starting-up internal machine of the cooling comfortable wind mode performs normal cooling control.
Compared with the prior art, the invention has the beneficial effects that: the invention realizes the temperature control of the multi-split air conditioner under different starting capacities and different starting modes under the refrigeration working condition, thereby not only meeting the requirements of users needing comfortable air, but also meeting the requirements of users needing quick refrigeration.
Drawings
FIG. 1 is a schematic diagram of detecting the temperature of the middle part of any flow path of heat exchange of an indoor unit;
FIG. 2 is a schematic diagram of a temperature detection structure for heat exchange installation of an indoor unit;
fig. 3 is a schematic diagram of a temperature sensing sleeve and elbow connection.
The drawing is marked: the temperature sensing sleeve 1, the temperature sensor 2, the clamp 3, the elbow 4 and the refrigerant pipe 5.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment provides a comfortable air control method of a multi-split air conditioner, which comprises the following steps:
first, it is determined which entry condition is satisfied by the cooling comfort wind mode, and four entry conditions in this embodiment are:
(1) The sum of the rated refrigerating capacity of the refrigerating comfortable wind mode starting internal machine and the rated refrigerating capacity of the normal refrigerating mode starting internal machine is less than 50% of the refrigerating capacity of the outdoor machine.
(2) Meanwhile, the rated refrigerating capacity of the indoor unit is less than 50% of the refrigerating capacity of the outdoor unit when the indoor unit is started in a refrigerating comfortable wind mode (2.1); (2.2) the difference value between the temperature of all the return air inlets of the startup internal machine and the set target temperature is not more than 1 ℃.
(3) The sum of the rated refrigerating capacity of the internal machine in the refrigeration comfortable wind mode and the rated refrigerating capacity of the internal machine in the normal refrigeration mode is more than or equal to 50% of the refrigerating capacity of the outdoor machine.
(4) Meanwhile, the rated refrigerating capacity of the indoor unit is more than or equal to 50% of the refrigerating capacity of the outdoor unit when the indoor unit is started in a refrigerating comfortable wind mode (4.1); (4.2) the difference value between the temperature of all the return air inlets of the startup internal machine and the set target temperature is not more than 1 ℃.
The following illustrates the entry conditions:
for example: the outdoor unit model is RFC100TX, the refrigerating capacity is 10KW, the indoor unit can be matched according to 100%, the matched model is RFUS22X 1 (rated refrigerating capacity 2.2 KW), RFUS25X 2 (rated refrigerating capacity 2.5 KW), and RFUS28X 1 (rated refrigerating capacity 2.8 KW).
If one RFUS22X model is opened to be in a cooling comfortable wind mode and one RFUS25X model is opened to be in a normal cooling mode, the total starting capacity is 2.2+2.5=4.7 KW, the capacity ratio is less than 50% (4.7/10×100% =47%), and the entering condition (1) is satisfied.
If one RFUS22X model is opened and one RFUS25X model is in a cooling comfortable wind mode, the total starting capacity is 2.2+2.5=4.7 KW, the capacity ratio is less than 50% (4.7/10×100% =47%), the entering condition (2.1) is met, then the difference between the temperature of the RFUS22X and the temperature of the RFUS25X return air inlet and the set target temperature is not more than 1 ℃, the entering condition (2.2) is met, and the entering condition (2) is met if the two conditions are met simultaneously.
If one RFUS22X model is opened to be in a cooling comfortable wind mode, and two RFUS25X models are in a normal cooling mode, the total starting capacity is 2.2+2.5+2.5=7.2 KW, the capacity ratio is more than 50% (7.2/10×100% =72%) and the entering condition (3) is satisfied.
If one RFUS22X model is opened to be in a cooling comfortable wind mode, two RFUS25X models are in a cooling comfortable wind mode, the total starting capacity is 2.2+2.5+2.5=7.2 KW, the capacity ratio is more than 50% (7.2/10X 100% =72%), the entering condition (4.1) is met, then the difference between the temperatures of return air inlets of the one RFUS22X model and the two RFUS25X models and the set target temperature is not more than 1 ℃, the entering condition (4.2) is met, and the entering condition (4) is met if the two conditions are met at the same time.
Then, if it is judged that the entry condition (1) is satisfied, the EEV control method is started:
and (3) normally controlling the low-pressure target pressure of all the indoor units when the indoor units are started, controlling the pressure to be 0.75Mpa, setting the normal refrigeration mode of the indoor units in the normal refrigeration mode, firstly detecting whether the difference between the temperature of a return air inlet and the set target temperature is not more than 1 ℃ or not by the indoor units in the refrigeration comfortable air mode, if the difference is not more than 1 ℃, controlling an Electronic Expansion Valve (EEV) by taking the superheat degree of 4 ℃ as an initial set value, regulating the superheat degree through the middle temperature of any flow path of the indoor unit heat exchange after 5 minutes, wherein the superheat degree = the middle temperature of any flow path of the indoor unit heat exchange is lower than 14 ℃ after 5 minutes, adding 1 ℃ on the basis of the existing superheat degree, subtracting 1 ℃ on the basis of the existing superheat degree after 5 minutes, wherein the middle temperature of any flow path of the indoor unit heat exchange is between 14 ℃ and 16 ℃, and keeping the superheat degree unchanged. In addition, if the middle temperature of any flow path of the indoor unit heat exchange or the temperature of the heat exchange inlet of the indoor unit reaches the freezing prevention temperature of 2.5 ℃, the superheat degree is immediately adjusted to 4 ℃, the opening degree of the electronic expansion valve is adjusted to the opening degree when the superheat degree is 4 ℃, then the control is continued by the existing superheat degree, the highest value of the superheat degree cannot exceed 6 ℃, and the lowest value cannot be lower than 3 ℃.
If the entering condition (2) is judged to be met, the following control method is started:
the wind speed was confirmed, and if the wind speed was high wind (high wind+ultra high wind), the low pressure target pressure was adjusted to 0.98Mpa, if the wind speed was medium wind, the low pressure target pressure was adjusted to 1Mpa, and if the wind speed was low wind (low wind+ultra low wind+mute), the low pressure target pressure was adjusted to 1.02Mpa, and in this example, the low pressure target pressure normal control pressure was 0.75Mpa, and the pressure was detected as the low pressure side integrated pressure of the entire refrigerant system, and the pressure was the pressure at the junction of all indoor unit heat exchange outlets. If the wind speeds of all the startup internal engines are different, the control is carried out according to the low-pressure target pressure corresponding to the lowest wind speed. For indoor units with different capacities, the rotating speed range of the low wind speed indoor unit is 345-370rpm, the rotating speed range of the medium wind speed indoor unit is 390-400rpm, and the rotating speed range of the high wind speed indoor unit is 435-450rpm.
The same EEV control method as entry condition (1) is then started:
the indoor unit in the refrigerating comfortable air mode is firstly set to detect whether the difference between the temperature of the return air inlet and the set target temperature is not more than 1 ℃, if the difference is met, the superheat degree is controlled by taking the superheat degree of 4 ℃ as an initial set value, the superheat degree is adjusted by the middle temperature of any flow path of the indoor unit after 5 minutes, the superheat degree = the middle temperature of any flow path of the indoor unit heat exchange-the temperature of the heat exchange outlet of the indoor unit heat exchange is lower than 14 ℃ after 5 minutes, the superheat degree is increased by 1 ℃ on the basis of the existing superheat degree, the middle temperature of any flow path of the continuous 5m indoor unit heat exchange is higher than 16 ℃, the superheat degree is reduced by 1 ℃ on the basis of the existing superheat degree, the middle temperature of any flow path of the indoor unit heat exchange is between 14 and 16 ℃, and the superheat degree is unchanged. In addition, if the middle temperature of any flow path of the indoor unit heat exchange or the temperature of the heat exchange inlet of the indoor unit reaches the freezing prevention temperature of 2.5 ℃, the superheat degree is immediately adjusted to 4 ℃, the opening degree of the electronic expansion valve is adjusted to the opening degree when the superheat degree is 4 ℃, then the control is continued by the existing superheat degree, the highest value of the superheat degree cannot exceed 6 ℃, and the lowest value cannot be lower than 3 ℃.
If the entering condition (3) is judged to be met, the same control method as the entering condition (1) is started, and the details are not repeated here.
If the entering condition (4) is judged to be met, starting the same control method as the entering condition (2): first, wind speed is checked, if the wind speed is high wind (high wind+ultra high wind), the low pressure target pressure is adjusted to 0.96Mpa, if the wind speed is low wind (low wind+ultra low wind+mute), the low pressure target pressure is adjusted to 0.98Mpa, if the wind speed is low wind (low wind+ultra low wind+mute), the low pressure target pressure is adjusted to 1Mpa, in this embodiment, the low pressure target pressure normal control pressure is 0.75Mpa, the pressure is detected as the low pressure side comprehensive pressure of the whole refrigerant system, and the pressure is the pressure at the outlet of all indoor units. If the wind speeds of all the startup internal engines are different, the control is carried out according to the low-pressure target pressure corresponding to the lowest wind speed.
The following EEV control method which is the same as the entry condition (1) is still performed, and will not be described again.
In this embodiment, the exit conditions of the entry conditions (1), (2), (3) and (4) are that if the difference between the temperature of the return air inlet and the set target temperature is greater than 2 ℃ in the cooling comfort air mode, the starting-up internal machine in the cooling comfort air mode performs normal cooling control.
The superheat degree of the indoor unit controlled by the normal refrigeration mode is 3 ℃, the formula is the total air pipe temperature of the indoor unit heat exchange and the middle temperature of any flow path of the indoor unit heat exchange=3 ℃, and the middle temperature of any flow path of the indoor unit heat exchange is collected at the position shown in the figure 3. Fig. 3 shows heat exchange of an indoor unit, fig. 1 and 2 show a device applied to heat exchange for improving temperature detection precision, the device comprises a temperature sensing sleeve 1, a temperature sensor 2, a clamp 3 and elbows 4, the elbows 4 are fixed on a refrigerant pipe 5 of the heat exchange, the temperature sensing sleeve 1 is welded on the two elbows 4, and the temperature sensor 2 is arranged inside the temperature sensing sleeve 1 and is fixed through the clamp 3. The temperature sensing sleeve pipe 1 interior face can fully cooperate with temperature sensor 2, better detected temperature, and outer face and elbow 4 weld together, because the welded surface is the plane, then the temperature of elbow 4 can be better give temperature sensing sleeve pipe 1, and then temperature sensor 2 can the higher accurate detection refrigerant temperature.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (7)
1. A comfortable wind control method of a multi-split air conditioner is characterized in that: the method is characterized in that refrigerating comfortable air mode control is carried out on an indoor unit meeting entering conditions, low-pressure target pressure is regulated according to different entering conditions, the middle temperature of any flow path of heat exchange of the indoor unit is detected once at intervals, if the continuous A time of the middle temperature of any flow path of heat exchange of the indoor unit is lower than 14 ℃, the superheat degree is 1 ℃ on the basis of the existing superheat degree, if the continuous A time of the middle temperature of any flow path of heat exchange of the indoor unit is higher than 16 ℃, the superheat degree is reduced by 1 ℃ on the basis of the existing superheat degree, if the middle temperature of any flow path of heat exchange of the indoor unit is continuously 14-16 ℃, the superheat degree is kept unchanged, the initial set value of the superheat degree is 4 ℃, the minimum superheat degree is 3 ℃ and the maximum superheat degree is 6 ℃, and the entering conditions are four respectively:
entry condition (1): the sum of the rated refrigerating capacity of the refrigerating comfortable wind mode starting internal machine and the rated refrigerating capacity of the normal refrigerating mode starting internal machine is less than 50% of the refrigerating capacity of the outdoor machine;
entry condition (2): meanwhile, the rated refrigerating capacity of the indoor unit is less than 50% of the refrigerating capacity of the outdoor unit when the indoor unit is started in a refrigerating comfortable wind mode (2.1); (2.2) the difference value between the temperature of the return air inlet of all the startup internal machines and the set target temperature is not more than 1 ℃;
entry condition (3): the sum of the rated refrigerating capacity of the internal machine in the refrigeration comfortable wind mode startup and the rated refrigerating capacity of the internal machine in the normal refrigeration mode startup is more than or equal to 50% of the refrigerating capacity of the outdoor machine;
entry condition (4): meanwhile, the rated refrigerating capacity of the indoor unit is more than or equal to 50% of the refrigerating capacity of the outdoor unit when the indoor unit is started in a refrigerating comfortable wind mode (4.1); (4.2) the difference value between the temperature of all the return air inlets of the startup internal machine and the set target temperature is not more than 1 ℃.
2. The method for controlling comfortable wind of multi-split air conditioner according to claim 1, wherein the method comprises the following steps: the air conditioner meeting the entering condition (1) and the entering condition (3) has the target pressure of 0.75Mpa.
3. The method for controlling comfortable wind of multi-split air conditioner according to claim 1, wherein the method comprises the following steps: the entry condition (2) is satisfied, the low-pressure target pressure is regulated through the wind speed, if the wind speed is high wind, the low-pressure target pressure is 0.98Mpa, if the wind speed is middle wind, the low-pressure target pressure is 1Mpa, and if the wind speed is low wind, the low-pressure target pressure is 1.02Mpa; for indoor units with different capacities, the rotating speed range of the low wind speed indoor unit is 345-370rpm, the rotating speed range of the medium wind speed indoor unit is 390-400rpm, and the rotating speed range of the high wind speed indoor unit is 435-450rpm.
4. The method for controlling comfortable wind of multi-split air conditioner according to claim 1, wherein the method comprises the following steps: the entry condition (4) is satisfied, the low-pressure target pressure is regulated through the wind speed, if the wind speed is high wind, the low-pressure target pressure is 0.96Mpa, if the wind speed is middle wind, the low-pressure target pressure is 0.98Mpa, and if the wind speed is low wind, the low-pressure target pressure is 1Mpa; for indoor units with different capacities, the rotating speed range of the low wind speed indoor unit is 345-370rpm, the rotating speed range of the medium wind speed indoor unit is 390-400rpm, and the rotating speed range of the high wind speed indoor unit is 435-450rpm.
5. The method for controlling comfortable wind of multi-split air conditioner according to claim 3 or 4, wherein the method comprises the following steps: and if the wind speeds of the internal engines are different in starting, controlling according to the low-pressure target pressure value corresponding to the lowest wind speed.
6. The method for controlling comfortable wind of multi-split air conditioner according to claim 1, wherein the method comprises the following steps: and if the temperature of the middle part of any flow path of the heat exchange of the indoor unit or the temperature of the heat exchange inlet of the indoor unit reaches the freezing prevention temperature, immediately adjusting the superheat degree to be 4 ℃.
7. The method for controlling comfortable wind of multi-split air conditioner according to claim 1, wherein the method comprises the following steps: the exit condition of the cooling comfortable wind mode is that if the cooling comfortable wind mode internal machine meets the condition that the difference between the temperature of the return air inlet and the set target temperature is more than 2 ℃, the starting internal machine of the cooling comfortable wind mode carries out normal cooling control.
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Citations (5)
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| US6405551B1 (en) * | 1999-05-20 | 2002-06-18 | Science, Inc. | Heating apparatus having refrigeration cycle |
| JP2005164064A (en) * | 2003-11-28 | 2005-06-23 | Sharp Corp | Air conditioner |
| CN111692730A (en) * | 2020-03-13 | 2020-09-22 | 广东美的制冷设备有限公司 | Air conditioner and sterilization control method thereof |
| CN115247858A (en) * | 2022-05-16 | 2022-10-28 | 美的集团武汉暖通设备有限公司 | Air conditioner, control method thereof, and computer-readable storage medium |
| CN115307280A (en) * | 2022-08-17 | 2022-11-08 | 广东美的制冷设备有限公司 | Control method and controller of multi-split air conditioning system, air conditioning system and medium |
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- 2022-11-14 CN CN202211421217.0A patent/CN115717761B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6405551B1 (en) * | 1999-05-20 | 2002-06-18 | Science, Inc. | Heating apparatus having refrigeration cycle |
| JP2005164064A (en) * | 2003-11-28 | 2005-06-23 | Sharp Corp | Air conditioner |
| CN111692730A (en) * | 2020-03-13 | 2020-09-22 | 广东美的制冷设备有限公司 | Air conditioner and sterilization control method thereof |
| CN115247858A (en) * | 2022-05-16 | 2022-10-28 | 美的集团武汉暖通设备有限公司 | Air conditioner, control method thereof, and computer-readable storage medium |
| CN115307280A (en) * | 2022-08-17 | 2022-11-08 | 广东美的制冷设备有限公司 | Control method and controller of multi-split air conditioning system, air conditioning system and medium |
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