CN105674641B - Air-conditioning system and the method for automatically adjusting the actual refrigerant charge of air-conditioning system - Google Patents

Air-conditioning system and the method for automatically adjusting the actual refrigerant charge of air-conditioning system Download PDF

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Publication number
CN105674641B
CN105674641B CN201410659795.7A CN201410659795A CN105674641B CN 105674641 B CN105674641 B CN 105674641B CN 201410659795 A CN201410659795 A CN 201410659795A CN 105674641 B CN105674641 B CN 105674641B
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China
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refrigerant
air
conditioning system
regulation tank
tank
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CN201410659795.7A
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Chinese (zh)
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CN105674641A (en
Inventor
陶宏
石达
朱习源
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上海海立电器有限公司
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Abstract

The invention discloses a kind of air-conditioning system and its computational methods and preferred scope of relevant design parameter, the circulating line of the air-conditioning system is connected with regulation tank, flexible separator is set in tank is adjusted, regulation tank is separated into the two parts sealed against each other by separator, a portion is pre-charged with gas, another part can be used for storing refrigerant, and the part for storing refrigerant connects with circulating line.When air-conditioning system works under different operating modes, the pressure change of refrigerant of the circulating line with adjusting tank junction is flowed through in circulating line, the amount for enabling to adjust the refrigerant stored in tank changes, so that the refrigerant charge in circulating line is equal or close to the optimum matching point of each operating mode, so as to improve efficiency of the air-conditioning in each operating mode, reach preferable refrigerating/heating effect.

Description

Air-conditioning system and the method for automatically adjusting the actual refrigerant charge of air-conditioning system

Technical field

The present invention relates to air-conditioning, and in particular to the matching of air-conditioning refrigerant charging amount.

Background technology

Solenoid operated four-way valve in air-conditioning system can change the direction of refrigerant flowing so that air-conditioning can either be in high temperature when system It is cold, it can also be heated in low temperature, dual-use.For air-conditioning when making refrigerating operaton, the refrigerant gas of low-temp low-pressure enters pressure The refrigerant gas for becoming HTHP is pressurized after contracting machine, the refrigerant gas of HTHP (is used as cold in outdoor heat exchanger Condenser) in condensation heat release, temperature reduce after liquid refrigerant be changed into low-temp low-pressure after throttling arrangement reducing pressure by regulating flow again Liquid, it is changed into the gas of low-temp low-pressure after the liquid refrigerant middle heat absorption evaporation of heat exchanger (being used as evaporator) indoors of low-temp low-pressure Body, enter back into compressor and compressed, so circulation.

For air-conditioning when making heating operation, the refrigerant gas of low-temp low-pressure becomes HTHP into pressurization after compressor Refrigerant gas, the refrigerant gas middle condensation heat release of heat exchanger (being used as condenser) indoors of HTHP, after temperature reduces Liquid refrigerant be changed into the liquid of low-temp low-pressure after throttling arrangement reducing pressure by regulating flow again, the liquid refrigerant of low-temp low-pressure exists It is changed into the gas of low-temp low-pressure in outdoor heat exchanger (being used as evaporator) after heat absorption evaporation, enters back into compressor and compressed, so Circulation.

As described above, during air conditioner refrigerating, outdoor unit is used as condenser, indoor set is used as evaporator;And when heating, outdoor unit It is used as condenser as evaporator, indoor set.In fact, outdoor unit heat exchanger many bigger than indoor set heat exchanger, and refrigerant It is mainly distributed in condenser, so the amount of the refrigerant needed during refrigeration during heating than needing the amount of refrigerant big.

In addition, in refrigeration or heating, air-conditioning can also be run under two kinds of operating modes of high frequency or low frequency.Air-conditioning is transported in high frequency During row, refrigerant flow rates are higher, liquid content is relatively low, and distribution of refrigerant amount is less in heat exchanger;And in low-frequency operation, refrigerant Flow velocity is relatively low, liquid content is more, and distribution of refrigerant amount is more in heat exchanger, therefore refrigerant required during compressor low-frequency operation Amount need the amount of refrigerant big when being run than high frequency.

The working characteristics of refrigerant charge and air-conditioning system is closely related, and the normal operation of air-conditioning system depends on being filled Whether the refrigerant amount of note is suitable, and refrigerant of the air-conditioning needed under refrigeration, heating and high frequency, low frequency difference operating mode is optimal Matching charging amount is different from.Therefore, refrigeration can be automatically adjusted under different operating modes there is an urgent need to develop one kind in this area The air-conditioning system of agent charging amount, so as to which air-conditioning is under each operating mode, the charging amount of refrigeration can be automatically adjusted to optimal With value so that the working characteristics of air-conditioning is more perfect.

The content of the invention

It is an object of the invention to provide a kind of sky that can automatically adjust actual refrigerant charge in air-conditioning system in real time Adjusting system.

The invention provides a kind of air-conditioning system, the air-conditioning system includes compressor, outdoor heat exchanger, indoor heat exchange Device, throttling arrangement and circulating line,

The circulating line is connected with regulation tank, and separator is provided with the regulation tank, and the separator is by the tune Section tank is separated into the two parts sealed against each other, and a portion is pre-charged with gas, and another part is used to store refrigerant, the use It is in fluid communication in the part of storage refrigerant with the circulating line, and the separator can deform, so as to change State two-part volume;Wherein,

When the air-conditioning system works under different operating modes, the circulating line and the tune are flowed through in the circulating line The pressure change of the refrigerant of tank junction is saved, the separator can be made to deform so that is stored in the regulation tank The amount of refrigerant changes, so as to change the refrigerant charge in the circulating line.

In a preferred embodiment, the regulation tank includes the first regulation tank, and the first regulation tank is connected to the outdoor and changed On circulating line between hot device and the throttling arrangement;And/or the regulation tank includes the second regulation tank, the second regulation tank connects It is connected on the circulating line between the indoor heat exchanger and the throttling arrangement.

The first regulation tank is used to store some refrigerant under high frequency cooling condition so that work in the circulating line The amount of the refrigerant of work is equal or close to the optimum matching point of air-conditioning system refrigerant charge under current refrigeration operating mode;And The first regulation tank discharge part refrigerant under low frequency cooling condition so that the amount of the refrigerant to be worked in the circulating line Equal or close to the optimum matching point of air-conditioning system refrigerant charge under current refrigeration operating mode;And/or

The second regulation tank is used to store some refrigerant under high frequency heating condition so that work in the circulating line The amount of the refrigerant of work is equal or close to the optimum matching point of air-conditioning system refrigerant charge under current heating condition;And Second regulation tank discharge part refrigerant under low frequency heating condition so that the amount of the refrigerant to be worked in the circulating line is equal to Or the optimum matching point close to air-conditioning system refrigerant charge under current heating condition.

In a preferred embodiment, the total charging amount of refrigerant in the air-conditioning system is more than or equal to the air-conditioning system Refrigerant best match charging amount under middle cooling condition.

In a preferred embodiment, the regulation tank is pre- in the regulation tank before the circulating line is connected to Gassy, the separator deform and are close to part regulation tank skin so that are used for the portion for storing refrigerant in the regulation tank Divide and do not have volume.

In a preferred embodiment, the Preliminary pressure-filled of the gas in the pre- gassiness regulation tank meets following want Ask:

(a) Preliminary pressure-filled in the first regulation tank is under heating condition refrigerant most higher than the air-conditioning system Big evaporating pressure, and it is less than the condensing pressure that the air-conditioning system is in refrigerant under specified cooling condition;And/or

(b) Preliminary pressure-filled in the second regulation tank is under cooling condition refrigerant most higher than the air-conditioning system Big evaporating pressure, and it is less than the condensing pressure that the air-conditioning system is in refrigerant under middle heating condition.

In a preferred embodiment, the Preliminary pressure-filled in the first regulation tank is in less than or equal to the air-conditioning system The condensing pressure of refrigerant under middle cooling condition.

In a preferred embodiment, when the total charging amount of refrigerant in the air-conditioning system is equal to the air-conditioning system in Between refrigerant best match charging amount under cooling condition when, the Preliminary pressure-filled in the first regulation tank can be greater than or equal to institute State the condensing pressure that air-conditioning system is in refrigerant under middle cooling condition.

In a preferred embodiment, the air-conditioning system is in the maximum evaporation pressure of refrigerant under heating condition and referred to The air-conditioning system is in the circulating line under low frequency heating condition between the throttling arrangement and the outdoor heat exchanger The pressure of refrigerant.

In a preferred embodiment, the air-conditioning system is in the condensing pressure of refrigerant under specified cooling condition and referred to The air-conditioning system is in the circulating line under specified cooling condition between the throttling arrangement and the outdoor heat exchanger The pressure of refrigerant.

In a preferred embodiment, the air-conditioning system is in the maximum evaporation pressure of refrigerant under cooling condition and referred to The air-conditioning system is in the circulating line under low frequency cooling condition between the throttling arrangement and the indoor heat exchanger The pressure of refrigerant.

In a preferred embodiment, the air-conditioning system is in the condensing pressure of refrigerant under middle heating condition and referred to The air-conditioning system is in the circulating line under middle cooling condition between the throttling arrangement and the indoor heat exchanger The pressure of refrigerant.

In a preferred embodiment, when the air-conditioning system is in cooling condition, system is not stored in the second regulation tank Cryogen, when the air-conditioning system is in high frequency cooling condition, refrigerant, the air-conditioning system are stored in the first regulation tank During in low frequency cooling condition, the amount of the refrigerant stored in the first regulation tank is less than described first under high frequency cooling condition The amount of the refrigerant stored in regulation tank does not store refrigerant;And/or

When the air-conditioning system is in heating condition, refrigerant, the air-conditioning system are not stored in the first regulation tank During in high frequency heating condition, refrigerant is stored in the second regulation tank;The air-conditioning system is in low frequency heating condition When, the described second amount for adjusting the refrigerant stored in tank is less than the system stored under high frequency heating condition in the second regulation tank The amount of cryogen.

Wherein, high frequency cooling condition refers to that the refrigerating capacity of air-conditioning is greater than or equal to the cooling condition of rated cooling capacity;Low frequency Cooling condition refers to that the refrigerating capacity of air-conditioning is less than or equal to the cooling condition of middle refrigerating capacity;

High frequency heating condition refers to that the heating capacity of air-conditioning is greater than or equal to the heating condition of specified heating capacity;Low frequency heats work Condition refers to that the heating capacity of air-conditioning is less than or equal to the heating condition of middle heating capacity.

In a preferred embodiment, the material for manufacturing the regulation tank and the separator has be selected from the group one Individual or multiple features:

It is compatible with refrigerant and refrigeration oil;

Temperature resistant range is -20 DEG C~150 DEG C;

5MPa pressure can be withstood greater than.

In a preferred embodiment, for manufacturing one or more of the material of the separator in following material: Neoprene, nitrile rubber, ethylene propylene diene rubber, Hypalon, fluorubber and polytetrafluoroethylene (PTFE);And/or

The separator can make when deforming the regulation tank be used to store refrigerant be partially expanded to three/ Two regulation tank volume;And/or

Material for manufacturing the tank body may be selected from the one or more in following material:

Cast iron, cast aluminium, carbon steel, stainless steel, copper and alloy;And/or

The gas is nitrogen or air.

In a preferred embodiment, the separator is flexible membrane structure.

Present invention also offers a kind of method for automatically adjusting the actual refrigerant charge of air-conditioning system, the air-conditioning system Including compressor, outdoor heat exchanger, indoor heat exchanger, throttling arrangement and circulating line, methods described includes:In the circulation pipe Regulation tank is connected with road;

Separator is provided with the regulation tank, the regulation tank is separated into the two parts sealed against each other by the separator, A portion is pre-charged with gas, and another part can be used for storing refrigerant, the part for being used to storing refrigerant with it is described Circulating line is in fluid communication and the separator can deform, so as to change the two-part volume;

When the air-conditioning system works under different operating modes, the circulating line and the tune are flowed through in the circulating line The pressure change of the refrigerant of tank junction is saved, the amount for the refrigerant that can make to store in the regulation tank changes, so as to Change the refrigerant charge in the circulating line.

In a preferred embodiment, in the above-mentioned methods, following between the outdoor heat exchanger and the throttling arrangement The first regulation tank is connected with endless tube road, is connected with the circulating line between the indoor heat exchanger and the throttling arrangement Second regulation tank.

In a preferred embodiment, in the above-mentioned methods, the regulation tank is before the circulating line is connected to, in institute Pre- gassy in regulation tank is stated, the pre- gassiness Preliminary pressure-filled for adjusting the gas in tank meets claimed below:

(a) Preliminary pressure-filled in the first regulation tank is under heating condition refrigerant most higher than the air-conditioning system Big evaporating pressure, less than the condensing pressure that the air-conditioning system is in refrigerant under specified cooling condition;And/or

(b) Preliminary pressure-filled in the second regulation tank is under cooling condition refrigerant most higher than the air-conditioning system Big evaporating pressure, less than the condensing pressure that the air-conditioning system is in refrigerant under middle heating condition.

In a preferred embodiment, in the above-mentioned methods, the Preliminary pressure-filled in the first regulation tank is less than or equal to institute State the condensing pressure that air-conditioning system is in refrigerant under middle cooling condition.

In a preferred embodiment, in the above-mentioned methods, the material for manufacturing the regulation tank and the separator has There are the one or more features being selected from the group:

It is compatible with refrigerant and refrigeration oil;

Temperature resistant range is -20 DEG C~150 DEG C;

5MPa pressure can be withstood greater than.

In a preferred embodiment, in the above-mentioned methods, the material that the separator is made may be selected from following material It is one or more:

Neoprene, nitrile rubber, ethylene propylene diene rubber, Hypalon, fluorubber and polytetrafluoroethylene (PTFE);And/or

Material for manufacturing the tank body may be selected from the one or more in following material:

Cast iron, cast aluminium, carbon steel, stainless steel, copper and alloy;And/or

The gas is nitrogen or air.

In a preferred embodiment, in the above-mentioned methods, methods described also includes the preliminary filling volume for determining the regulation tank And Preliminary pressure-filled:

(1) provide the air-conditioning system under each operating mode, flowed through in the circulating line circulating line with it is described Adjust pressure, the data of temperature of the refrigerant of tank junction;

(2) refrigerant for providing each operating mode of air-conditioning system most preferably fills matching value;

(3) pressure, temperature data and the Preliminary pressure-filled as described above requirement provided according to step (1), it is determined that described The Preliminary pressure-filled of tank is adjusted, and the preliminary filling volume of the regulation tank is calculated by the equation of gas state.

Above-mentioned gas state equation includes The Ideal-Gas Equation and/or the gas after being modified for real gas State equation.

In a preferred embodiment, each operating mode includes low frequency refrigeration, high frequency refrigeration, low frequency heating and high frequency heating Four kinds of operating modes.

In a preferred embodiment, in the case that the Preliminary pressure-filled meets above-mentioned Preliminary pressure-filled requirement, the regulation tank Volume should be small as much as possible.

In a preferred embodiment, in the above-mentioned methods, the total charging amount of refrigerant in the air-conditioning system is more than or waited In refrigerant best match charging amount of the air-conditioning system under middle cooling condition, wherein

The total charging amount of refrigerant for the air-conditioning system that rated cooling capacity is 2600W is about 700~about 900g;And/or

The total charging amount of refrigerant for the air-conditioning system that rated cooling capacity is 3500W is about 1000~about 1200g;And/or

The total charging amount of refrigerant for the air-conditioning system that rated cooling capacity is 5000W is about 1400~about 1800g;And/or

The total charging amount of refrigerant for the air-conditioning system that rated cooling capacity is 7200W is about 2000~about 2400g;And/or

The total charging amount of refrigerant for the air-conditioning system that rated cooling capacity is 12000W is about 3600~about 4000g.

Specified refrigeration, middle refrigeration, specified heating and the middle namespace uri heated as refrigeration industry, wherein,

The refrigeration efficiency of air-conditioning system is than the refrigeration efficiency for air-conditioning system under middle cooling condition under specified cooling condition Twice of ratio;

The heating energy efficiency ratio of air-conditioning system is the heat efficiency of air-conditioning system under middle heating condition under specified heating condition Twice of ratio.

In a preferred embodiment, in the above-mentioned methods, the gas Preliminary pressure-filled of the first regulation tank be about 1.25~ About 3.0MPa, and/or

The gas Preliminary pressure-filled of the second regulation tank is about 0.75~about 2.25MPa.

In a preferred embodiment, in the above-mentioned methods, it is described when the rated cooling capacity of the air-conditioning system is 2600W The preliminary filling volume of first regulation tank is about 400~about 700ml, and the preliminary filling volume of the second regulation tank is 100~400ml;With/ Or

When the rated cooling capacity of the air-conditioning system is 3500W, the preliminary filling volume of the first regulation tank for 500~ 900ml, the preliminary filling volume of the second regulation tank is about 200~about 500ml;And/or

When the rated cooling capacity of the air-conditioning system is 5000W, the preliminary filling volume of the first regulation tank for 800~ 1200ml, the preliminary filling volume of the second regulation tank is about 300~about 600ml;And/or

When the rated cooling capacity of the air-conditioning system is 7200W, the preliminary filling volume of the first regulation tank for 1000~ 1500ml, the preliminary filling volume of the second regulation tank is about 400~about 800ml;And/or

When the rated cooling capacity of the air-conditioning system is 12000W, the preliminary filling volume of the first regulation tank for 2000~ 3000ml, the preliminary filling volume of the second regulation tank is about 500~about 1200ml.

In a preferred embodiment, in the above-mentioned methods, when the air-conditioning system is in high frequency cooling condition, the circulation Refrigerant charge in pipeline, refrigerant storage in refrigerant storage amount and the second regulation tank in the first regulation tank The mass percent for measuring the total charging amount of refrigerant of duty adjusting system is respectively about 90%~about 95%, about 5%~about 10% and 0%;And/or

When the air-conditioning system is in low frequency cooling condition, refrigerant charge, described first are adjusted in the circulating line Save tank in refrigerant storage amount and it is described second regulation tank in refrigerant storage amount duty adjusting system the total charging amount of refrigerant Mass percent be respectively 100%, 0% and 0%;And/or

When the air-conditioning system is in high frequency heating condition, refrigerant charge, described first are adjusted in the circulating line Save tank in refrigerant storage amount and it is described second regulation tank in refrigerant storage amount duty adjusting system the total charging amount of refrigerant Mass percent be respectively about 80%~about 85%, 0% and about 15%~about 20%;And/or

When the air-conditioning system is in low frequency heating condition, refrigerant charge, described first are adjusted in the circulating line Save tank in refrigerant storage amount and it is described second regulation tank in refrigerant storage amount duty adjusting system the total charging amount of refrigerant Mass percent be respectively about 85%~about 90%, 0% and about 10%~about 15%.

The air-conditioning system of the present invention can automatically adjust to be when refrigeration and heating condition, compressor low frequency and high frequency are run The actual refrigerant charge of system, improve system effectiveness.

Brief description of the drawings

Fig. 1 is that the air-conditioning for automatically adjusting refrigerant charge with the present invention is in cooling condition and compressor is with high frequency Schematic diagram during operation;

Fig. 2 is that the air-conditioning for automatically adjusting refrigerant charge with the present invention is in cooling condition and compressor is with low frequency Schematic diagram during operation;

Fig. 3 is that the air-conditioning for automatically adjusting refrigerant charge with the present invention is in heating condition and compressor is with high frequency Schematic diagram during operation;And

Fig. 4 is that the air-conditioning for automatically adjusting refrigerant charge with the present invention is in heating condition and compressor is with low frequency Schematic diagram during operation.

Embodiment

Presently preferred embodiments of the present invention is described in detail below with reference to accompanying drawing, to become apparent from understanding the present invention's Objects, features and advantages.It should be understood that embodiment shown in the drawings does not limit the scope of the present invention, and it is simply The connotation of explanation technical solution of the present invention.

Automatically adjust the air-conditioning of refrigerant charge

Description in background technology, refrigerant best match charging amount of the air-conditioning system in cooling condition are more than system Refrigerant best match charging amount during thermal condition;And refrigerant best match charging amount during compressor low-frequency operation is more than pressure Refrigerant best match charging amount when contracting machine high frequency is run.

Inventor creatively with the addition of simple annex (the regulation tank i.e. filled with gas) in traditional air-conditioning system, And by calculating and testing the parameters such as the volume for determining regulation tank, aeration quantity so that air-conditioning system has under different operating modes certainly The function of dynamic regulation refrigerant charge, so as to meet requirements above.The preferred embodiment of the present invention is as described below.

Traditional air-conditioning system mainly includes compressor 1, fluid reservoir 2, four-way valve 3, outdoor heat exchanger 4, indoor heat exchanger 5th, throttling arrangement 6 and circulating line.In the embodiment of the present invention shown in accompanying drawing 1-4, P1 and P2 positions within air-conditioning systems It is connected to the first regulation tank 7 and the second regulation tank 7 '.Each regulation tank can pass through three-way pipe and the circulation pipe of air-conditioning system Road connects.

In the preferred embodiments of the present invention, the first regulation tank 7 or second, which adjusts tank 7 ', to be separately existed in circulating line, Cold/hot air-conditioning processed can be set to play a part of certain self-regulation refrigerant charge.

It is provided with each regulation tank and is used to for regulation tank to be separated into the two-part separator 8 sealed against each other, is adjusted in tank The part of separator more than 8 is used to store gas 9, and after appropriate gas is pre-charged with, the gas storage part keeps sealing with extraneous; Part of the separator below 8 and the circulating line of air-conditioning are in fluid communication, and under some operating modes, part of the separator below 8 can Store a certain amount of refrigerant 10.

Material for manufacturing tank body and separator has the one or more features being selected from the group:

It is compatible with refrigerant and refrigeration oil;

Temperature resistant range is -20 DEG C~150 DEG C;

Compressive resistance is higher than 5MPa.

Separator 8 can take any suitable form, as long as it can be according to the pressure differential between gas 9 and refrigerant 10 Deformed along corresponding direction, so as to change in regulation tank by the two-part volume of its separation.Preferably, separator is tool Flexible membrane structure.

The material for being preferably made from separator 8 may be selected from one or more in following material:Neoprene (Neoprene), nitrile rubber (Buna), ethylene propylene diene rubber (EPDM), Hypalon (Hypalon), fluorubber (Viton, ) and polytetrafluoroethylene (PTFE) (PTFE) Aflas.

The material for being preferably made from tank body may be selected from one or more in following material:It is cast iron, cast aluminium, carbon steel, stainless Steel, copper and alloy.

Alternatively, the separator material of the separator of the first regulation tank 7 and the second regulation tank 7 ' is identical or different.

Preferably, it is nitrogen or air that the first regulation tank 7 and second, which adjusts the gas being filled with tank 7 ',.

Alternatively, the gas of the gas of the first regulation preliminary filling of tank 7 and the second regulation preliminary filling of tank 7 ' is identical or different.

, can be to air-conditioning before or after the regulation regulation tank 7 ' of tank 7 and second of connection first at the P1 and P2 of air-conditioning system Refrigerant is filled with the circulating line of system, the total amount being filled with is equal to refrigerant optimal of the air-conditioning system in middle cooling condition With charging amount.

It should be noted that actually refrigerant be filled with total amount can also be more than air-conditioning system middle cooling condition system Cryogen best match charging amount, to avoid air-conditioning system in the case where refrigerating capacity is less than the low frequency cooling condition of middle cooling condition, system The situation of cryogen charging amount deficiency occurs.The refrigerant for entering regulation tank described in the present embodiment is liquid refrigeration/hot working fluid.

, can be by two regulations after being full of the gas with certain pressure value in advance to the first regulation regulation tank 7 ' of tank 7 and second Tank is respectively connecting on circulating line.Here " being full of in advance " refers to adjusting the gas pressure in the above section of separator 8 of tank Power causes separator to deform downwards and is close to the regulation tank skin of bottom, equivalent to gas full of whole regulation tank, and adjusts in tank Separator does not have volume with lower part.Pre- gassiness regulation tank meets claimed below:

Preliminary pressure-filled in (1) first regulation tank 7 is in the possible maximum evaporation pressure of heating condition higher than air-conditioning system (the refrigerant maximum pressure i.e. under heating condition at P1), condensing pressure during specified cooling condition is in less than air-conditioning system (refrigerant pressure under i.e. specified cooling condition at P1)

Further, when the Preliminary pressure-filled in the first regulation tank 7 is in middle cooling condition less than or equal to air-conditioning system Condensing pressure (refrigerant pressure among i.e. under cooling condition at P1);

Preliminary pressure-filled in (2) second regulation tanks 7 ' is in the maximum evaporation pressure of cooling condition (i.e. higher than air-conditioning system Refrigerant pressure under cooling condition at P2), condensing pressure when middle heating condition is in less than air-conditioning system is (middle to make Refrigerant pressure under thermal condition at P2).

The frequency of air-conditioning system is inversely proportional with its evaporating pressure, directly proportional to its condensing pressure, i.e. air conditioner running frequency Lower, its evaporating pressure is bigger, and condensing pressure is smaller.

Fig. 1 and Fig. 2 respectively illustrates the air-conditioning system in high frequency refrigeration and low frequency cooling condition, in its circulating line Refrigerant flows in the counterclockwise direction, and the refrigerant pressure of the P1 positions of pipeline is more than the refrigerant pressure of P2 positions.

In the present invention, mentioned high frequency refrigeration, low frequency refrigeration, high frequency heating and the concept of low frequency heating are as follows:

High frequency cooling condition refers to that the refrigerating capacity of air-conditioning is greater than or equal to the cooling condition of rated cooling capacity;Low frequency refrigeration work Condition refers to that the refrigerating capacity of air-conditioning is less than or equal to the cooling condition of middle refrigerating capacity;

High frequency heating condition refers to that the heating capacity of air-conditioning is greater than or equal to the heating condition of specified heating capacity;Low frequency heats work Condition refers to that the heating capacity of air-conditioning is less than or equal to the heating condition of middle heating capacity.

Because the Preliminary pressure-filled in the second regulation tank 7 ' is higher than possible maximum evaporation pressure (the i.e. cooling condition of cooling condition Refrigerant maximum pressure at lower P2), i.e., either high frequency refrigeration is (see Fig. 1) or low frequency refrigeration is (see Fig. 2), the second regulation tank Gas Preliminary pressure-filled in 7 ' is consistently higher than in pipeline the refrigerant pressure at P2, and gas, which remains, in the second regulation tank 7 ' fills Full state, makes the second regulation tank 7 ' not store refrigerant when air-conditioning system is in cooling condition.

As shown in figure 1, under high frequency cooling condition, the Preliminary pressure-filled in the first regulation tank 7 is less than the refrigerant pressure at P1 Power, gas in some refrigerant extruding separator 8 compression the first regulation tank 7 in circulating line and be filled with the first regulation tank 7, Until the gas of the both sides of separator 8 and the pressure of refrigerant are equal.And after this is in stable condition, temperature and P1 after gas compression heat absorption The temperature for locating refrigerant is roughly equal.

As shown in Fig. 2 when being converted into low frequency cooling condition by high frequency cooling condition, the refrigerant pressure in circulating line at P1 Power reduces (i.e. condensing pressure reduces), and the gas expansion adjusted in tank 7 will adjust all or part of refrigerant row stored in tank Go out into circulating line.

Fig. 3 and Fig. 4 shows the air-conditioning system in heating condition, and the refrigerant in its circulating line is along clockwise direction Flowing, the refrigerant pressure of the P2 positions of pipeline are more than the refrigerant pressure of P1 positions.

Required according to gas Preliminary pressure-filled in regulation tank described above, either high frequency heating is (see Fig. 3) or low frequency Heating operating mode (see Fig. 4), the first Preliminary pressure-filled adjusted in tank 7 are consistently higher than air-conditioning system and are in the possible maximum of heating condition Evaporating pressure (the refrigerant maximum pressure i.e. under heating condition at P1), gas remains pre- and is full of shape in the first regulation tank 7 State, the first regulation tank 7 is set not store refrigerant when air-conditioning system is in heating condition.

As shown in figure 3, under high frequency heating condition, the Preliminary pressure-filled in the second regulation tank 7 ' is less than the refrigerant pressure at P2 Power, gas in the unnecessary refrigerant extruding separator compression adjustment tank in circulating line and be filled with regulation tank, until separating The gas of part both sides and the pressure of refrigerant are equal.

As shown in figure 4, when being converted into low frequency heating condition by high frequency heating condition, the refrigerant pressure in circulating line at P2 Power reduces (i.e. condensing pressure reduces), and the gas expansion in the second regulation tank 7 ' freezes the part of storage in the second regulation tank 7 ' Agent is expelled in circulating line.

By the way that qualitatively description can be seen that the refrigerant pressure by circulating line mesohigh side with adjusting in tank above The relation of gas pressure, the amount of the refrigerant stored in tank can be controlled to adjust, so as to ensure the system of air-conditioning system real work The amount of cryogen meets the refrigerant charge optimum matching point of each different operating modes.

In fact, except pressure condition, also need to consider the temperature of refrigerant difference operating mode diverse location, and combine different works The refrigerant of condition most preferably fills matching value, to determine to adjust the volume of tank, adjust the relevant parameters such as tank pre-charging pressure, to complete The present invention.

In order to more comprehensively disclose particularly the present invention, regulation tank is introduced hereinafter in connection with a specific example Volume, the regulation relevant parameter such as tank pre-charging pressure calculating and choosing method.

Calculation formula

In order to calculate simplicity, the gas (hereinafter referred to as doing " gas ") that separator above section is filled with tank will be adjusted and seen Make perfect gas, calculated using The Ideal-Gas Equation pV=nRT, in formula,

P is the pressure of gas,

V is the volume of gas,

N is the molal quantity of gas,

R is mol gas constant,

T is thermodynamic temperature.

Here, the work operating mode of air-conditioning is simplified to high frequency heating, low frequency heating, high frequency refrigeration and low frequency four kinds of works of refrigeration Condition.And the computational methods and formula provided herein are to be directed to the total charging amount of refrigerant in air-conditioning system to be equal to air-conditioning system low The situation of the refrigerant best match charging amount of frequency cooling condition.In this case, air conditioner is transported under low frequency cooling condition During row, refrigerant is neither stored with the first gas tank and the second gas tank 7 '.

If the pre volume of the first regulation tank 7 is VA, Preliminary pressure-filled position pA;Second regulation tank 7 ' pre volume be VB, Preliminary pressure-filled position pB.Wherein, pA、pBValue should meet Preliminary pressure-filled requirement described above.Assuming that the first regulation tank 7 and the Gas temperature when two regulation tanks 7 ' fill is identical, and TA=TB=25 DEG C (298K).

During cooling condition, play refrigerant charge adjustment effect is the first regulation tank 7.Under known high frequency cooling condition, The pressure p of refrigerant at circulating line P1High frequency freezesWith temperature THigh frequency freezes.Assuming that in low frequency cooling condition, adjust in tank and do not store system Cryogen, in high frequency refrigerating state, the volume for adjusting the refrigerant stored in tank is V1, the pressure of gas is p1, gas temperature is T1, wherein p1=pHigh frequency freezes, T1=THigh frequency freezes

Because gas is in closed state in regulation tank, the molal quantity of gas is constant, can be with by The Ideal-Gas Equation Release below equation:

Required according to Preliminary pressure-filled, select pA, V can be calculatedA

During heating condition, play refrigerant charge adjustment effect is the second regulation tank 7 '.Under known high frequency heating condition, The pressure p of refrigerant at circulating line P2High frequency heatsWith temperature THigh frequency heats, and under low frequency heating condition, made at circulating line P2 The pressure p of cryogenLow frequency heatsWith temperature TLow frequency heats

Assuming that in low frequency heating condition, in order that the refrigerant charge in the circulatory system is equal to optimum matching point, regulation The volume of the refrigerant stored in tank is V2, the pressure of gas is p2, gas temperature T2, wherein p2=pLow frequency heats, T1=TLow frequency heats; State is heated in high frequency, the volume for adjusting the refrigerant stored in tank is V3, the pressure of gas is p3, gas temperature T3, wherein p3=pHigh frequency heats, T3=THigh frequency heats

Because gas is in closed state in regulation tank, the molal quantity of gas is constant, can be with by The Ideal-Gas Equation Release below equation:

By above formula, can obtain:

Thus, it is possible to calculate VB, and PB.It should be noted that for the P calculatedB, also need to verify whether it meets preacceleration inflation The requirement of power.If PBMeet Preliminary pressure-filled requirement, it is determined that VBAnd PBPre volume for the second regulation tank is and preacceleration inflation Power.

If PBPreliminary pressure-filled requirement is unsatisfactory for, answers prioritizing selection to disclosure satisfy that Preliminary pressure-filled required pressure P 'B.Through excessive Secondary tentative calculation, it is V ' to redefine and the volume that refrigerant is stored in tank is adjusted during low frequency heating2, adjust when high frequency heats and stored in tank The volume of refrigerant is V '3, Preliminary pressure-filled P 'BWith preliminary filling volume V 'B, wherein, V '2、V′3Should as much as possible respectively with V2、V3Phase Deng.

In addition, above-mentioned calculation formula is based on The Ideal-Gas Equation, gram of revised real gas can also be used La Bailong equations are calculated.

Embodiment

Using preferred embodiment described above and according to above-mentioned computational methods, by following steps, the first tune is determined The volume and Preliminary pressure-filled of tank and the second regulation tank are saved, the air-conditioning that certain brand rated cooling capacity is 3500W can be modified to have There is the function of automatically adjusting refrigerant charge:

(1) refrigerant pressure, the temperature data of circulating line P1, P2 opening position when the air-conditioning is in different operating modes are obtained, As shown in table 1.

Table 1

In the present embodiment, the specified heating, middle heating, middle refrigeration and four kinds of operating modes of specified refrigeration in form are right respectively Above the high frequency described in calculation formula heats Ying Yu, low frequency heats, low frequency freezes and high frequency four kinds of operating modes of refrigeration.

(2) obtain the refrigerant that the air-conditioning is under each operating mode and most preferably fill matching value, wherein, middle cooling condition Optimum matching point is 1000g, and the total charging amount of refrigerant for selecting air-conditioning system is 1000g.

(3) the Preliminary pressure-filled p of the first regulation tank is determinedAWith preliminary filling volume VA

According to each working condition pressure value in the requirement of previously described Preliminary pressure-filled and table 1, there is 25bar<pA<30bar;

The refrigerant charge matching value of specified refrigeration is 930g, according to V=m/ ρ (ρ is the density of refrigerant), is conversed The refrigerant volume V stored under the operating mode in the first regulation tank1, and according to formula

Calculate and correspond to pAVAValue, as shown in table 2.

Table 2

First regulation tank Preliminary pressure-filled pA/bar First regulation tank volume VA/ml 26 732.8 27 1152 28 2697

Regulation tank design wishes that volume is as small as possible, therefore selects Preliminary pressure-filled ps of the 26bar as the first regulation tankA, it is right The regulation tank volume V answeredA=732.8ml.

(4) the Preliminary pressure-filled p of the first regulation tank is determinedAWith preliminary filling volume VA

According to each working condition pressure value in Preliminary pressure-filled requirement above and table 1, there is 11bar<pB<21bar;

According to middle heating condition and the optimum matching point of specified heating, V is determined2And V3, and utilize formula

Calculate PB, due to the P calculatedBValue be unsatisfactory for Preliminary pressure-filled requirement, then select 11~21bar between pressure Value is selected close to V as the second regulation tank Preliminary pressure-filled2And V3Volume as refrigerant storage volume in regulation tank, full Sufficient formula

Under conditions of, by multiple tentative calculation, relatively reasonable result of calculation is obtained, wherein selecting pB=12.96bar, then VB =211.4ml, now refrigerant charge is 880g in the circulatory system under specified heating condition, cyclic system under middle heating condition Refrigerant charge is 920g in system.

Inflate in advance two regulation tanks are connected respectively at the P1 and P2 of the air-conditioning duct, improved air-conditioning system can The charging amount of the circulatory system is automatically adjusted according to operating mode, its data is as shown in Table 3.

Table 3

As noted earlier, the air-conditioning after improvement is under cooling condition, and refrigerant charge is equal to optimal in the circulatory system Setting with value, therefore the first regulation tank serves the effect for effectively improving cooling condition air-conditioning efficiency;And under heating condition, Refrigerant charge is not equal in the circulatory system, but close to optimum matching point, the setting of the second regulation tank is to air-conditioning heating work The effect that condition efficiency improves is smaller.

It should be noted that in the present embodiment, the refrigerant charging total amount of air-conditioning system is equal to the filling under middle cooling condition Measure optimum matching point, and if air-conditioning need to refrigerating capacity be less than middle cooling condition more low frequency run when, it may be considered that by sky The total charging amount of refrigerant of adjusting system is set greater than 1000g some value, to ensure that air-conditioning is transported under this more low frequency operating mode During row, refrigerant is sufficient.If making this change, then above-mentioned calculating process correspondingly changes.

Relevant parameter

For the air-conditioning of different model and specification, the design parameter of the first regulation tank and the second regulation tank can all become Change.Inventor have passed through substantial amounts of experiment, calculate and study, and is directed to the air-conditioning system using embodiment of the present invention, obtains The scope of the relevant design parameter of different size air-conditioning, as shown in table 4.

Table 4

For the air-conditioning of different model and specification, the amount of automatically adjusting of refrigerant charge also has not under each operating mode Together.In the present invention, under different operating modes, the amount duty adjusting system of refrigerant in the circulatory system, the first regulation tank and the second regulation tank The mass percent of total charging amount is as shown in table 5.

Table 5

The air-conditioning of refrigerant charge of automatically adjusting of the present invention can be by by unnecessary refrigerant under different operating modes Be stored in regulation tank in, and cause the circulatory system in refrigerant charge be equal or close to each operating mode optimum matching point, from And efficiency of the air-conditioning in each operating mode is improved, reach preferable refrigerating/heating effect.

It is pointed out that for some air-conditioning systems, such as single cold or single hot air-conditioning system, a regulation tank is provided only with The efficiency of air-conditioning can be equally improved to a certain extent.Presently preferred embodiments of the present invention has been described in detail above, it should be understood that Arrive, after the above-mentioned instruction content of the present invention has been read, those skilled in the art can make various changes or repair to the present invention Change.These equivalent form of values equally fall within the application appended claims limited range.

Claims (22)

1. a kind of air-conditioning system, the air-conditioning system includes compressor, outdoor heat exchanger, indoor heat exchanger, throttling arrangement and followed Endless tube road, it is characterised in that
The circulating line is connected with regulation tank, and separator is provided with the regulation tank, and the separator is by the regulation tank The two parts sealed against each other are separated into, a portion is pre-charged with gas, and another part is used to store refrigerant, described to be used to store up The part for depositing refrigerant connects with the circulating line, and the separator can deform, so as to change described two parts Volume;Wherein,
When the air-conditioning system works under different operating modes, the circulating line and the regulation tank are flowed through in the circulating line The pressure change of the refrigerant of junction, the separator can be made to deform so that the refrigeration stored in the regulation tank The amount of agent changes, so as to change the refrigerant charge in the circulating line;
Before the circulating line is connected to, the pre- gassy in the regulation tank, the separator becomes the regulation tank Shape and be close to part regulation tank skin so that it is described regulation tank in be used for store refrigerant part do not have volume.
2. air-conditioning system as claimed in claim 1, it is characterised in that the regulation tank includes the first regulation tank, the first regulation Tank is connected on the circulating line between the outdoor heat exchanger and the throttling arrangement.
3. air-conditioning system as claimed in claim 1, it is characterised in that the regulation tank includes the second regulation tank, the second regulation Tank is connected on the circulating line between the indoor heat exchanger and the throttling arrangement.
4. air-conditioning system as claimed in claim 1, it is characterised in that the regulation tank includes the first regulation tank, the first regulation Tank is connected on the circulating line between the outdoor heat exchanger and the throttling arrangement;And
The regulation tank includes the second regulation tank, and the second regulation tank is connected between the indoor heat exchanger and the throttling arrangement Circulating line on.
5. air-conditioning system as claimed in claim 1, it is characterised in that the total charging amount of refrigerant in the air-conditioning system is more than Or the refrigerant best match charging amount equal to the air-conditioning system under middle cooling condition.
6. the air-conditioning system as described in claim 2 or 4, it is characterised in that the gas in the pre- gassiness regulation tank Preliminary pressure-filled meet it is claimed below:
Preliminary pressure-filled in the first regulation tank is in the maximum evaporation of refrigerant under heating condition higher than the air-conditioning system Pressure, and it is less than the condensing pressure that the air-conditioning system is in refrigerant under specified cooling condition.
7. the air-conditioning system as described in claim 3 or 4, it is characterised in that the gas in the pre- gassiness regulation tank Preliminary pressure-filled meet it is claimed below:
Preliminary pressure-filled in the second regulation tank is in the maximum evaporation of refrigerant under cooling condition higher than the air-conditioning system Pressure, and it is less than the condensing pressure that the air-conditioning system is in refrigerant under middle heating condition.
8. air-conditioning system as claimed in claim 6, it is characterised in that the Preliminary pressure-filled in the first regulation tank is less than or waited In the condensing pressure that the air-conditioning system is under middle cooling condition.
9. the air-conditioning system as described in claim 2 or 4, it is characterised in that
When the air-conditioning system is in high frequency cooling condition, refrigerant is stored in the first regulation tank,
When the air-conditioning system is in low frequency cooling condition, the amount of the refrigerant stored in the first regulation tank is less than high frequency system The amount of the refrigerant stored under cold operating mode in the first regulation tank does not store refrigerant;And/or
When the air-conditioning system is in heating condition, refrigerant is not stored in the first regulation tank.
10. the air-conditioning system as described in claim 3 or 4, it is characterised in that when the air-conditioning system is in cooling condition, institute State in the second regulation tank and do not store refrigerant;And/or
When the air-conditioning system is in high frequency heating condition, refrigerant is stored in the second regulation tank;
When the air-conditioning system is in low frequency heating condition, the amount of the refrigerant stored in the second regulation tank is less than high frequency system The amount of the refrigerant stored under thermal condition in the second regulation tank.
11. air-conditioning system according to claim 1, it is characterised in that for manufacturing the regulation tank and the separator Material there are one or more features for being selected from the group:
It is compatible with refrigerant and refrigeration oil;
Temperature resistant range is -20 DEG C~150 DEG C;
5MPa pressure can be born.
12. air-conditioning system according to claim 1, it is characterised in that for manufacture the separator material be selected from One or more in lower material:Neoprene, nitrile rubber, ethylene propylene diene rubber, Hypalon, fluorubber and polytetrafluoroethylene (PTFE); And/or
The separator can make when deforming the regulation tank be used to store refrigerant be partially expanded to 2/3rds Adjust tank volume;And/or
For manufacturing one or more of the material of tank body in following material:
Cast iron, cast aluminium, carbon steel, stainless steel, copper and alloy;And/or
The gas is nitrogen or air.
13. air-conditioning system according to claim 1, it is characterised in that the separator is flexible membrane structure.
14. a kind of method for automatically adjusting the actual refrigerant charge of air-conditioning system, the air-conditioning system includes compressor, outdoor Heat exchanger, indoor heat exchanger, throttling arrangement and circulating line, it is characterised in that methods described includes:On the circulating line Connection regulation tank;
Separator is provided with the regulation tank, the regulation tank is separated into the two parts sealed against each other by the separator, wherein A part is pre-charged with gas, and another part can be used for storing refrigerant, described to be used to store the part of refrigerant and the circulation The pipeline communication and separator can deform, so as to change the two-part volume;
When the air-conditioning system works under different operating modes, the circulating line and the regulation tank are flowed through in the circulating line The pressure change of the refrigerant of junction, the amount for the refrigerant that can make to store in the regulation tank changes, so as to change Refrigerant charge in the circulating line;
The regulation of connection first tank on circulating line between the outdoor heat exchanger and the throttling arrangement;
Wherein, the regulation tank is before the circulating line is connected to, the pre- gassy in the regulation tank, the preliminary filling The Preliminary pressure-filled of gas in the regulation tank of full gas meets claimed below:
Preliminary pressure-filled in the first regulation tank is in the maximum evaporation of refrigerant under heating condition higher than the air-conditioning system Pressure, less than the condensing pressure that the air-conditioning system is in refrigerant under specified cooling condition.
15. method as claimed in claim 14, it is characterised in that following between the indoor heat exchanger and the throttling arrangement The regulation of connection second tank on endless tube road.
16. method as claimed in claim 15, it is characterised in that it is described regulation tank before the circulating line is connected to, The pre- gassy in the regulation tank, the pre- gassiness Preliminary pressure-filled for adjusting the gas in tank also meet following want Ask:
Preliminary pressure-filled in the second regulation tank is in the maximum evaporation of refrigerant under cooling condition higher than the air-conditioning system Pressure, less than the condensing pressure that the air-conditioning system is in refrigerant under middle heating condition.
17. method as claimed in claim 14, it is characterised in that methods described also includes determining that the preliminary filling of the regulation tank holds Product and Preliminary pressure-filled:
(1)The air-conditioning system is provided under each operating mode, the circulating line and the regulation are flowed through in the circulating line The pressure of the refrigerant of tank junction, the data of temperature;
(2)The refrigerant for providing each operating mode of the air-conditioning system most preferably fills matching value;
(3)According to step(1)Pressure, temperature data and the Preliminary pressure-filled requirement of offer, determine the preacceleration inflation of the regulation tank Power, and the preliminary filling volume for adjusting tank is calculated by the equation of gas state.
18. according to the method for claim 14, it is characterised in that the total charging amount of refrigerant in the air-conditioning system is more than Or the refrigerant charge equal to air-conditioning system under middle cooling condition, wherein
The total charging amount of refrigerant for the air-conditioning system that rated cooling capacity is 2600W is 700~900g;And/or
The total charging amount of refrigerant for the air-conditioning system that rated cooling capacity is 3500W is 1000~1200g;And/or
The total charging amount of refrigerant for the air-conditioning system that rated cooling capacity is 5000W is 1400~1800g;And/or
The total charging amount of refrigerant for the air-conditioning system that rated cooling capacity is 7200W is 2000~2400g;And/or
The total charging amount of refrigerant for the air-conditioning system that rated cooling capacity is 12000W is 3600~4000g.
19. according to the method for claim 14, it is characterised in that the gas Preliminary pressure-filled of the first regulation tank is 1.25 ~3.0MPa.
20. according to the method for claim 15, it is characterised in that the gas Preliminary pressure-filled of the second regulation tank is 0.75 ~2.25MPa.
21. according to the method for claim 15, it is characterised in that
When the rated cooling capacity of the air-conditioning system is 2600W, the preliminary filling volume of the first regulation tank is 400~700ml, institute The preliminary filling volume for stating the second regulation tank is 100~400ml;And/or
When the rated cooling capacity of the air-conditioning system is 3500W, the preliminary filling volume of the first regulation tank is 500~900ml, institute The preliminary filling volume for stating the second regulation tank is 200~500ml;And/or
When the rated cooling capacity of the air-conditioning system is 5000W, the preliminary filling volume of the first regulation tank is 800~1200ml, The preliminary filling volume of the second regulation tank is 300~600ml;And/or
When the rated cooling capacity of the air-conditioning system is 7200W, the preliminary filling volume of the first regulation tank is 1000~1500ml, The preliminary filling volume of the second regulation tank is 400~800ml;And/or
When the rated cooling capacity of the air-conditioning system is 12000W, the preliminary filling volume of the first regulation tank for 2000~ 3000ml, the preliminary filling volume of the second regulation tank is 500~1200ml.
22. according to the method for claim 15, it is characterised in that
When the air-conditioning system is in high frequency cooling condition, refrigerant charge, the first regulation tank in the circulating line The matter of the total charging amount of refrigerant of refrigerant storage amount duty adjusting system in middle refrigerant storage amount and the second regulation tank It is respectively 90%~95%, 5%~10% and 0% to measure percentage;And/or
When the air-conditioning system is in low frequency cooling condition, refrigerant charge, the first regulation tank in the circulating line The matter of the total charging amount of refrigerant of refrigerant storage amount duty adjusting system in middle refrigerant storage amount and the second regulation tank It is respectively 100%, 0% and 0% to measure percentage;And/or
When the air-conditioning system is in high frequency heating condition, refrigerant charge, the first regulation tank in the circulating line The matter of the total charging amount of refrigerant of refrigerant storage amount duty adjusting system in middle refrigerant storage amount and the second regulation tank It is respectively 80%~85%, 0% and 15%~20% to measure percentage;And/or
When the air-conditioning system is in low frequency heating condition, refrigerant charge, the first regulation tank in the circulating line The matter of the total charging amount of refrigerant of refrigerant storage amount duty adjusting system in middle refrigerant storage amount and the second regulation tank It is respectively 85%~90%, 0% and 10%~15% to measure percentage.
CN201410659795.7A 2014-11-18 2014-11-18 Air-conditioning system and the method for automatically adjusting the actual refrigerant charge of air-conditioning system CN105674641B (en)

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