CN111271855B - Method for improving bias flow of modular multi-split air conditioning unit and air conditioning unit - Google Patents
Method for improving bias flow of modular multi-split air conditioning unit and air conditioning unit Download PDFInfo
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- CN111271855B CN111271855B CN202010213448.7A CN202010213448A CN111271855B CN 111271855 B CN111271855 B CN 111271855B CN 202010213448 A CN202010213448 A CN 202010213448A CN 111271855 B CN111271855 B CN 111271855B
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000007788 liquid Substances 0.000 claims abstract description 20
- 238000010438 heat treatment Methods 0.000 claims description 13
- 238000012544 monitoring process Methods 0.000 claims description 5
- 239000003507 refrigerant Substances 0.000 abstract description 4
- 239000003570 air Substances 0.000 description 79
- 230000001276 controlling effect Effects 0.000 description 8
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- F24F11/89—Arrangement or mounting of control or safety devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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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
The invention relates to the technical field of air conditioners, in particular to a method for improving bias flow of a modular multi-split air conditioner unit and the air conditioner unit. Meanwhile, the air valve and the liquid valve of the air conditioner outdoor unit are dynamically adjusted according to the difference value of the highest suction superheat degree and the lowest suction superheat degree in the operation process of the air conditioning unit, so that the phenomenon of bias flow is further avoided. The invention is suitable for a modularized multi-split air conditioning unit, and ensures that the refrigerant does not deviate when circulating from different external units.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a method for improving bias flow of a modular multi-split air conditioning unit and the air conditioning unit.
Background
An Air Conditioner (Air Conditioner) is a device that manually adjusts and controls parameters such as temperature, humidity, and flow rate of ambient Air in a building or structure. Generally comprises a cold source/heat source device, a cold and hot medium delivery and distribution system, a terminal device and other auxiliary devices. The system mainly comprises a refrigeration host, a water pump, a fan and a pipeline system. The end device is responsible for specifically processing the air state by utilizing the cold and heat quantity from the transmission and distribution so as to enable the air parameters of the target environment to meet the requirements. With the development of air conditioning industry, the energy provided by a single external unit is not enough to meet the huge demand, and the multi-unit parallel combined energy supply is an effective improvement mode. However, when multiple units are connected in parallel and work cooperatively, a plurality of difficulties are faced, when the existing multiple-unit parallel heat pump type air conditioner runs, the capacity of the external unit is not completely the same, so that the phenomenon that the refrigerant distribution is uneven when the unit runs is more and more popular, the drift phenomenon is serious, and the aging degree of the unit can be accelerated and the reliability of the unit can be reduced due to the drift phenomenon after the unit runs for a long time.
Disclosure of Invention
In order to solve the above problems, the present invention provides a method for improving a bias flow of a modular multi-split air conditioning unit, and an air conditioning unit based on the method for improving the bias flow of the modular multi-split air conditioning unit.
The invention is realized by adopting the following scheme:
a method for improving bias flow of a modular multi-split air conditioning unit is characterized in that each unit of the air conditioning unit is provided with a valve capable of receiving a receiving instruction, the refrigerating/heating output quantity of each air conditioner outdoor unit in the air conditioning unit and the suction superheat degree of all the air conditioner outdoor units are obtained, whether the air conditioning unit has a bias flow phenomenon or not is judged by using the output quantity and the suction superheat degree, and when the air conditioning unit has the bias flow phenomenon, the suction quantity of an air conditioner is adjusted by controlling the opening degree of the valve.
Further, the monitoring of the air suction superheat degree of all the air conditioner outdoor units refers to comparing the difference value between the highest air suction superheat degree and the lowest air suction superheat degree; and when the difference value between the highest suction superheat degree and the lowest suction superheat degree is larger than X, adjusting the valve opening of the air conditioner outdoor unit.
Furthermore, the adjustment of the valve opening degree of the air conditioner external unit refers to the adjustment of an air valve and a liquid valve of the air conditioner external unit, and the air valve and the liquid valve are adjusted according to 2B/5s DEG C; and B is the step number of the electronic expansion valve, and the adjustment of the gas valve and the liquid valve according to 2B/5 s-DEG C means that the step number of the electronic expansion valve is increased by 2 steps when the temperature rises by 1 ℃ every 5 seconds.
Further, the method comprises the following detailed steps:
step 1, starting an air conditioning unit;
step 2, monitoring the refrigerating/heating output quantity of each air conditioner external unit in the air conditioning unit in real time and the air suction superheat degree of each air conditioner external unit;
step 3, comparing the refrigerating/heating output quantities of different air-conditioning outdoor units, comparing the difference value between the highest suction superheat degree and the lowest suction superheat degree, judging whether the air-conditioning unit has a bias flow phenomenon, if not, turning to step 6, and if so, turning to step 4;
step 4, balancing air suction and oil return of different air conditioners by controlling the opening of the valve through a program;
step 5, when the difference value between the highest suction superheat degree and the lowest suction superheat degree is larger than X, adjusting an air valve and a liquid valve of an air conditioner outdoor unit until no bias flow phenomenon is generated;
and 6, normally operating the air conditioning unit.
Further, the step 5 specifically includes: and (4) dynamically adjusting the difference value of the suction superheat degrees from an air valve and a liquid valve of an air conditioner outdoor unit to all units to be less than Y, namely judging that no bias flow phenomenon is generated.
Further, the step of controlling the opening of the valve through the program refers to calculating a ratio of the output of the air conditioner to be adjusted to the total output of the air conditioning unit, and calculating the opening of the valve of the air conditioner outdoor unit according to the percentage of the ratio.
Further, the adjusting of the valve opening of the air conditioner external unit according to the percentage of the ratio refers to adjusting the opening of an air valve and a liquid valve of the air conditioner external unit.
Further, the opening regulating proportion of the gas valve and the liquid valve is 10: 1.
further, when the air conditioning unit is provided with one air conditioner only, the phenomenon of bias current is judged to be absent.
An air conditioning unit and a method for improving bias flow by applying the modular multi-split air conditioning unit are disclosed.
Compared with the prior art, the invention has the following beneficial effects:
each machine of the air conditioning unit is provided with a valve capable of receiving instructions, the refrigerating/heating output quantity of each air conditioning outdoor unit in the air conditioning unit and the suction superheat degree of all the air conditioning outdoor units are obtained in the operation process of the air conditioning unit, when the drift current phenomenon occurs, the suction capacity of the air conditioner is adjusted by controlling the opening degree of the valve through a program, the low-capacity unit can be ensured to obtain more balanced return air and return oil in the operation process, the problem that the high-power operation unit sucks more gas in the return air process to cause insufficient suction capacity of the air conditioning unit is solved, and the operation reliability of the unit is ensured. Meanwhile, the air valve and the liquid valve of the air conditioner outdoor unit are dynamically adjusted according to the difference value of the highest suction superheat degree and the lowest suction superheat degree in the operation process of the air conditioning unit, so that the phenomenon of bias flow is further avoided. The invention is suitable for a modularized multi-split air conditioning unit, and ensures that the refrigerant does not deviate when circulating from different external units.
Detailed Description
To facilitate an understanding of the present invention for those skilled in the art, the present invention will be described in further detail below with reference to specific embodiments and accompanying drawings.
The invention provides a method for improving bias flow of a modular multi-split air conditioning unit, wherein each unit of the air conditioning unit is provided with a valve capable of receiving an instruction, the refrigerating/heating output quantity of each air conditioner outdoor unit in the air conditioning unit is obtained, the suction superheat degree of all the air conditioner outdoor units is obtained, whether the air conditioning unit has a bias flow phenomenon or not is judged by using the output quantity and the suction superheat degree, and when the air conditioning unit has the bias flow phenomenon, the suction quantity of the air conditioner is adjusted by controlling the opening degree of the valve. The method for acquiring the refrigerating/heating output quantity of each air conditioner outdoor unit in the air conditioning unit and acquiring the suction superheat degree of all the air conditioner outdoor units are real-time and can be realized through a main control board/a main control chip of the air conditioning unit or by additionally arranging an independent module.
The monitoring of the air suction superheat degree of all the outdoor unit sets refers to comparing the difference value between the highest air suction superheat degree and the lowest air suction superheat degree; and when the difference value between the highest suction superheat degree and the lowest suction superheat degree is more than 5 ℃, adjusting the opening degree of a valve of an air conditioner outdoor unit.
The adjustment of the valve opening degree of the air conditioner external unit means that the opening degrees of an air valve and a liquid valve of the air conditioner external unit are adjusted, and the air valve and the liquid valve are adjusted according to 2B/5 s. The lower the suction superheat, the smaller the air valve (suction valve) at that position is closed at 2B/DEG C, and the larger the suction superheat is opened at 2B/DEG C. Where B is the electronic expansion valve step number, for example, B is 1 step, 2B/5s ° c means that when the temperature rises by 1 degree per 5 seconds, the electronic expansion valve step number increases by 2 steps, and so on.
The method comprises the following detailed steps:
step 1, starting an air conditioning unit;
step 2, monitoring the refrigerating/heating output quantity of each air conditioner external unit in the air conditioning unit in real time and the air suction superheat degree of each air conditioner external unit;
step 3, comparing the refrigerating/heating output quantities of different air-conditioning outdoor units, comparing the difference value between the highest suction superheat degree and the lowest suction superheat degree, judging whether the air-conditioning unit has a bias flow phenomenon, if not, turning to step 6, and if so, turning to step 4;
step 4, balancing air suction and oil return of different air conditioners by controlling the opening of the valve through a program;
step 5, when the difference value between the highest air suction superheat degree and the lowest air suction superheat degree is larger than X (X is 5 ℃ in the embodiment), adjusting an air valve and a liquid valve of an air conditioner outdoor unit until no bias flow phenomenon is generated; when the degree of superheat of the inspiration is more than 1 ℃ and less than 5 ℃, no measures need to be taken.
And 6, normally operating the air conditioning unit.
The step 5 specifically comprises the following steps: the difference value of the suction superheat degrees from an air valve and a liquid valve of an air conditioner outdoor unit to all units is dynamically adjusted to be smaller than Y (Y is 1 ℃ in the embodiment), and then the condition that no bias flow phenomenon is generated is judged.
The step of controlling the opening of the valve through the program refers to calculating the ratio of the output quantity of the air conditioner to be adjusted to the total output quantity of the air conditioning unit, and adjusting the opening of the valve of the air conditioner external unit according to the percentage of the ratio, including adjusting the opening of an air valve and a liquid valve. The opening regulating ratio of the gas valve to the liquid valve is 10: 1.
in this embodiment, capacity is abbreviated as outdoor unit cooling/heating output, for example, three air conditioners are provided in an air conditioning unit, and if the capacity of the machine 1 is a, the capacity of the machine 2 is B, and the capacity of the machine 3 is C, the capacity is a/(a + B + C) when the ratio of the output of the air conditioner to be adjusted to the total output of the air conditioning unit is calculated; B/(A + B + C); C/(A + B + C). When there are more than three units, capacity No. 1: a; capability No. 2B; capability No. 3C; machine capability No. 4: d, respectively calculating the ratio of the output quantity of the air conditioner to be regulated to the total output quantity of the air conditioning unit, namely A/(A + B + C + D); B/(A + B + C + D); C/(A + B + C + D); D/(A + B + C + D), and so on.
In this embodiment, an air conditioning unit having three air conditioners is taken as an example, and when adjusting the valve, the opening degree of the valve is adjusted by 5% at a time, that is, [ a/(a + B + C) ] + 5%, [ B/(a + B + C) ] + 5%, [ C/(a + B + C) ] + 5%, according to the percentage of the ratio of the changing capacity at a time. In practical implementation, the adjusting percentage is not limited to 5%, and may be other values, depending on the specific requirement, if the single time exceeds 10%, the valve opening needs to be increased by 0.5%. The air return and the oil return of the low-capacity unit can be more balanced during operation, the problem that the small-capacity unit is insufficient in air suction amount due to the fact that the high-power operation unit sucks more air during air return is solved, the operation reliability of the unit is guaranteed, and the opening of the adjusting valve is adjusted to change the flow rate.
An air conditioning unit and a method for improving bias flow by applying the modular multi-split air conditioning unit are disclosed.
Each machine of the air conditioning unit is provided with a valve capable of receiving instructions, the refrigerating/heating output quantity of each air conditioning outdoor unit in the air conditioning unit and the suction superheat degree of all the air conditioning outdoor units are obtained in the operation process of the air conditioning unit, when the drift current phenomenon occurs, the suction capacity of the air conditioner is adjusted by controlling the opening degree of the valve through a program, the low-capacity unit can be ensured to obtain more balanced return air and return oil in the operation process, the problem that the high-power operation unit sucks more gas in the return air process to cause insufficient suction capacity of the air conditioning unit is solved, and the operation reliability of the unit is ensured. Meanwhile, the air valve and the liquid valve of the air conditioner outdoor unit are dynamically adjusted according to the difference value of the highest suction superheat degree and the lowest suction superheat degree in the operation process of the air conditioning unit, so that the phenomenon of bias flow is further avoided. The invention is suitable for a modularized multi-split air conditioning unit, and ensures that the refrigerant does not deviate when circulating from different external units.
In the description of the present invention, it is to be understood that the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings and are only for convenience in describing the present invention and simplifying the description, but are not intended to indicate or imply that the indicated devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second", etc. 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. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, e.g., as meaning permanently attached, removably attached, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
While the invention has been described in conjunction with the specific embodiments set forth above, it is evident that many alternatives, modifications, and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, it is intended to embrace all such alternatives, modifications, and variations that fall within the scope of the included claims.
Claims (3)
1. A method for improving bias flow of a modular multi-connected air conditioning unit is characterized in that,
each machine of the air conditioning unit is provided with a valve capable of receiving an instruction, the refrigerating/heating output quantity of each air conditioning outdoor machine in the air conditioning unit is obtained, the air suction superheat degree of all the air conditioning outdoor machines is obtained, the difference value of the highest air suction superheat degree and the lowest air suction superheat degree is compared, whether the air conditioning unit has a bias flow phenomenon or not is judged by utilizing the air suction superheat degree, and when the air conditioning unit has the bias flow phenomenon and the difference value of the highest air suction superheat degree and the lowest air suction superheat degree is larger than X, the opening degree of the valve of the air conditioning outdoor machine is adjusted to adjust the air suction quantity of the air conditioning unit; the method comprises the following detailed steps:
step 1, starting an air conditioning unit;
step 2, monitoring the refrigerating/heating output quantity of each air conditioner external unit in the air conditioning unit in real time and the air suction superheat degree of each air conditioner external unit;
step 3, comparing the refrigerating/heating output quantities of different air-conditioning outdoor units, comparing the difference value between the highest suction superheat degree and the lowest suction superheat degree, judging whether the air-conditioning unit has a bias flow phenomenon, if not, turning to step 6, and if so, turning to step 4;
step 4, balancing air suction and oil return of different air conditioners by controlling the opening of the valve through a program, wherein the control of the opening of the valve through the program means that the ratio of the output quantity of the air conditioner to be adjusted to the total output quantity of an air conditioning unit is calculated, and the openings of an air valve and a liquid valve of an air conditioner outdoor unit are adjusted according to the percentage of the ratio of the single adjustment change capacity;
step 5, when the difference value between the highest air suction superheat degree and the lowest air suction superheat degree is larger than X, adjusting the valve opening of an air conditioner external unit until no bias current phenomenon is generated, wherein the adjustment of the valve opening of the air conditioner external unit is to adjust the opening of an air valve and a liquid valve of the air conditioner external unit, and the air valve and the liquid valve are adjusted according to the temperature of 2B/5 s; b is the step number of the electronic expansion valve; the step 5 specifically comprises the following steps: dynamically adjusting the difference value of the air suction superheat degrees from an air valve and a liquid valve of an air conditioner outdoor unit to all units to be less than Y, namely judging that no bias flow phenomenon is generated;
and 6, normally operating the air conditioning unit.
2. The method for improving the bias flow of the modular multi-split air conditioning unit as recited in claim 1, wherein no bias flow phenomenon is determined when the air conditioning unit is turned on by one air conditioner.
3. An air conditioning unit, characterized in that the method for improving the bias flow of the modular multi-split air conditioning unit is applied to the modular multi-split air conditioning unit as claimed in any one of claims 1-2.
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| CN115614910B (en) * | 2022-10-11 | 2024-08-20 | 珠海格力电器股份有限公司 | Refrigerant bias flow processing method and device and modularized air conditioning unit |
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