CN103982987B - Prevent the method and system of coolant bias current, multi-connected air conditioner in multi-connected air conditioner - Google Patents
Prevent the method and system of coolant bias current, multi-connected air conditioner in multi-connected air conditioner Download PDFInfo
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Abstract
The invention provides a kind of method and system preventing coolant bias current in multi-connected air conditioner and multi-connected air conditioner.Prevent the method for coolant bias current in multi-connected air conditioner from including: to obtain the degree of superheat of each indoor heat converter；The degree of superheat of acquisition is compared with target superheat degree, when the degree of superheat obtained and target superheat degree are unequal, the aperture of variable expansion valve, make the degree of superheat of indoor heat converter tend to equal with target superheat degree；If aperture regulation to the maximum duration of expansion valve reaches preset duration, the degree of superheat of indoor heat converter is the most unequal with target superheat degree, then revise target superheat degree, then according to the degree of superheat and the comparative result of revised target superheat degree, the aperture of variable expansion valve of indoor heat converter.What the present invention provided prevents the method for coolant bias current in multi-connected air conditioner, considers project installation situation and the actual load of indoor set, the aperture of Based Intelligent Control electronics expansion valve, reduces the bias current of coolant, the refrigeration of equilibrium indoor set.
Description
Technical field
The present invention relates to art of refrigeration units, more specifically, relate to one and prevent coolant in multi-connected air conditioner
The method of bias current, the system preventing coolant bias current in multi-connected air conditioner and a kind of multi-connected air conditioner.
Background technology
Drag in many multiple central air conditioner devices (i.e. connecting multiple indoor set on an off-premises station) one,
How to reduce the bias current of coolant in indoor set under refrigerating state, the refrigeration of equilibrium indoor set is always the most in the industry
Problem the most deeply concerned.Indoor set more and more have employed degree of superheat control technology at present, and this is in certain journey
Alleviate the unbalanced phenomenon of refrigeration of indoor set on degree, but multiple central air conditioner device is at Practical Project
Installation situation more complicated, such as there is Super long tube, high drop or the pipe arrangement caused due to type selecting mistake
The problems such as long and pipe arrangement caliber is less than normal, all may aggravate the bias current of indoor set.
To this end, there are two kinds of solutions in correlation technique, wherein first method is: to run indoor set
Quantity revise the benchmark degree of superheat of indoor set, the indoor set quantity benchmark making each indoor set of operation more
The degree of superheat is the least, and the indoor set quantity of operation is the fewest makes the benchmark degree of superheat of each indoor set the biggest；The second side
Method is: judges and revises the aperture of electronic expansion valve of indoor unit according to length of pipe, thus revise the degree of superheat.
But above two method all has the disadvantage that above two method is merely according to the fortune of indoor set
The length of line number amount or pipeline controls the aperture of electric expansion valve, and can not consider the engineering of indoor set
Installation situation and actual load, the aperture of Based Intelligent Control electronics expansion valve, reduce the bias current of coolant.
Summary of the invention
It is contemplated that at least solve one of technical problem present in prior art.
To this end, the purpose of first aspect of the present invention is, it is provided that one is cold in preventing multi-connected air conditioner
The method of matchmaker's bias current, it is possible to consider project installation situation and actual load, the Based Intelligent Control of indoor set
The aperture of electric expansion valve, reduces the bias current of coolant.
The purpose of second aspect of the present invention is, it is provided that one prevents coolant bias current in multi-connected air conditioner
System.
The purpose of third aspect of the present invention is, it is provided that one have above-mentioned prevent multi-connected air conditioner in
The multi-connected air conditioner of the system of coolant bias current.
For achieving the above object, the embodiment of first aspect of the present invention provides one and prevents multiple
The method of coolant bias current in air-conditioning, comprises the following steps: step S102, obtains described multi-connected air conditioner
The degree of superheat of each indoor heat converter；Step S104, by the degree of superheat of each described indoor heat converter
Compare with target superheat degree, when the degree of superheat and the described target superheat of the described indoor heat converter obtained
When spending unequal, the aperture of expansion valve of regulation indoor set, make described indoor heat converter overheated of acquisition
Degree tends to equal with described target superheat degree；Step S106, if the aperture regulation of described expansion valve is to maximum
Duration when reaching preset duration, the degree of superheat of the described indoor heat converter of acquisition and described target superheat degree
The most unequal, then revise described target superheat degree, return described step S102, and by revised target
The degree of superheat is as the described target superheat degree in described step S104.
What the above embodiment of the present invention provided prevents in multi-connected air conditioner in the method for coolant bias current, first, and will
The degree of superheat of each indoor heat converter obtained under refrigerating state compares with target superheat degree, if obtaining
The degree of superheat of indoor heat converter equal with target superheat degree, the most do not change the aperture of expansion valve；If obtaining
The degree of superheat of indoor heat converter more than target superheat degree, then indoor heat converter is in overload state,
By increasing the aperture of expansion valve, the coolant flowing through indoor heat converter increases, and releases overload state；
If the degree of superheat of the indoor heat converter obtained is less than target superheat degree, then coolant may be with the shape of gas-liquid two-phase
State flows into compressor, causes damage compressor, therefore, can reduce room by reducing the aperture of expansion valve
The flow of coolant in inside heat exchanger, in order to avoid coolant flows into compressor with the coolant of gas-liquid two-phase.In this process
In, the aperture of expansion valve according to the load adjustment of indoor set, and then control the flow of coolant, prevent coolant
Bias current occurs.
If after the aperture regulation of expansion valve is to maximum, and regulation reaches preset duration to maximum duration, obtaining
The degree of superheat of indoor heat converter still unequal with target superheat degree, now need to revise target superheat
Degree, then compares the degree of superheat of the indoor heat converter of acquisition with revised target superheat degree, and
The aperture of expansion valve is controlled according to comparative result, similarly, if the degree of superheat and the revised target mistake that obtain
Temperature is equal, does not the most change the aperture of expansion valve；If the degree of superheat obtained is more than revised target superheat degree,
Then increase the aperture of expansion valve；If the degree of superheat obtained is less than revised target superheat degree, then reduce expansion
The aperture of valve.In the process, fully take into account the refrigeration situation of each indoor set, and adjust expansion accordingly
The aperture of valve, and then control the flow of coolant, prevent coolant from bias current occurring.
In sum, what the above embodiment of the present invention provided prevents the method for coolant bias current in multi-connected air conditioner
In, it is possible to consider the actual load situation of indoor set, the aperture of the expansion valve of Based Intelligent Control indoor set,
Reduce the bias current of coolant.
It addition, prevent the method for coolant bias current in multi-connected air conditioner according to what the above embodiment of the present invention provided
Also there is following additional technical feature:
According to one embodiment of present invention, also include after described step S106: step S108, if
Described target superheat degree after the correction of preset times, the degree of superheat of the described indoor heat converter of acquisition with
The most unequal through preset times revised target superheat degree, then report to the police.
According to one embodiment of present invention, described preset times is 3.
According to one embodiment of present invention, n-th revised target superheat degree is equal to unmodified
Described target superheat degree adds the natural number that n, n are the most described preset times.
According to one embodiment of present invention, in described step S104, if the described Indoor Thermal obtained
The degree of superheat of exchanger is big more than the degree of superheat of described target superheat degree or the described indoor heat converter of acquisition
In revised target superheat degree, then increase the aperture of described expansion valve；If the described Indoor Thermal exchange obtained
The degree of superheat of device is less than less than the degree of superheat of described target superheat degree or the described indoor heat converter of acquisition and repaiies
Target superheat degree after just, then reduce the aperture of described expansion valve.
According to one embodiment of present invention, in described step S102, obtain one every Preset Time
The degree of superheat of secondary described indoor heat converter.
According to one embodiment of present invention, the degree of superheat of described indoor heat converter is that described Indoor Thermal is handed over
The temperature of the exit coolant of parallel operation and the difference of the temperature of porch coolant.
According to one embodiment of present invention, the described target superheat degree before correction is 0～5 DEG C.
The embodiment of second aspect of the present invention provides and a kind of prevents coolant bias current in multi-connected air conditioner
System, including: degree of superheat acquiring unit, for obtaining each indoor heat converter of described multi-connected air conditioner
The degree of superheat；Regulation unit, compares the degree of superheat of each described indoor heat converter with target superheat degree
Relatively, when the degree of superheat and the described target superheat degree of the described indoor heat converter obtained are unequal, conditioning chamber
The aperture of the expansion valve of interior machine, makes the degree of superheat of the described indoor heat converter of acquisition and described target superheat degree
Tend to equal；And amending unit, if the aperture regulation of described expansion valve reaches preset duration to maximum duration
Time, the degree of superheat of the described indoor heat converter of acquisition is the most unequal with described target superheat degree, revises described
Target superheat degree, and using revised target superheat degree as the described target superheat in described regulation unit
Degree.
It addition, according to the above embodiment of the present invention provide prevent coolant bias current in multi-connected air conditioner be
Unite and also there is following additional technical feature:
According to one embodiment of present invention, prevent the system of coolant bias current in multi-connected air conditioner from also wrapping described in
Include alarm unit, if after described amending unit carries out the correction of preset times to described target superheat degree, obtain
The described degree of superheat the most unequal with through preset times revised target superheat degree, the most described alarm unit enters
Row is reported to the police.
According to one embodiment of present invention, described degree of superheat acquiring unit includes: detector unit, described
Detector unit includes the first temperature-sensitive bag and the second temperature-sensitive bag, described first temperature-sensitive bag and described indoor heat converter
Entrance be connected, and the temperature of the porch coolant of described indoor heat converter can be detected, described second sense
Thermometer bulb is connected with the outlet of described indoor heat converter, and can detect the exit coolant of described heat exchanger
Temperature；And computing unit, the temperature of the exit coolant calculating described indoor heat converter is cold with porch
The difference of the temperature of matchmaker, obtains the degree of superheat of described indoor heat converter
The embodiment of third aspect of the present invention provides a kind of multi-connected air conditioner, includes any of the above-described reality
Execute and prevent the system of coolant bias current in multi-connected air conditioner described in example.
Additional aspect and the advantage of the present invention will become obvious in following description part, or by this
The practice of invention is recognized.
Accompanying drawing explanation
Above-mentioned and/or the additional aspect of the present invention and advantage are from combining the accompanying drawings below description to embodiment
Will be apparent from easy to understand, wherein:
Fig. 1 is according to preventing the method for coolant bias current in multi-connected air conditioner described in one embodiment of the invention
Flow chart；
Fig. 2 is according to preventing the system of coolant bias current in multi-connected air conditioner described in one embodiment of the invention
Schematic block diagram；
Fig. 3 is according to preventing the system of coolant bias current in multi-connected air conditioner described in another embodiment of the present invention
Schematic block diagram；
Fig. 4 is to prevent the operation principle schematic diagram of the system of coolant bias current in multi-connected air conditioner shown in Fig. 3；
Fig. 5 is the structural representation according to the multi-connected air conditioner described in one embodiment of the invention.
Wherein, in Fig. 2 to Fig. 5, corresponding relation between reference and component names is:
1 off-premises station, 10 off-premises station control units, 2 indoor sets, 20 indoor set control units,
21 indoor set detector units, 210 first temperature-sensitive bags, 211 second temperature-sensitive bags,
22 electronic expansion valve of indoor unit, 23 indoor heat converters, 24 indoor set alarm units,
200 prevent the system of coolant bias current in multi-connected air conditioner, 202 acquiring units, 2022 detector units,
2024 computing units, 204 regulation unit, 206 amending units, 208 alarm units
Detailed description of the invention
In order to be more clearly understood that the above-mentioned purpose of the present invention, feature and advantage, below in conjunction with attached
The present invention is further described in detail by figure and detailed description of the invention.It should be noted that not
In the case of conflict, the feature in embodiments herein and embodiment can be mutually combined.
Elaborate a lot of detail in the following description so that fully understanding the present invention, but,
The present invention can implement to use other to be different from mode described here, therefore, and the guarantor of the present invention
Scope of protecting is not limited by following public specific embodiment.
Describe with reference to the accompanying drawings according to some embodiments of the invention prevent multi-connected air conditioner in coolant inclined
The method of stream, the system preventing coolant bias current in multi-connected air conditioner and multi-connected air conditioner.
As it is shown in figure 1, the one provided according to some embodiments of the invention prevents coolant in multi-connected air conditioner
The method of bias current, comprises the following steps:
Step S102, obtains the degree of superheat of each indoor heat converter of described multi-connected air conditioner；
Step S104, compares the degree of superheat of each described indoor heat converter with target superheat degree,
When the degree of superheat of the described indoor heat converter obtained is unequal with target superheat degree, regulate the swollen of indoor set
The aperture of swollen valve, makes the degree of superheat of the described indoor heat converter of acquisition tend to phase with described target superheat degree
Deng；
Step S106, if aperture regulation to the maximum duration of described expansion valve reaches preset duration, obtains
The degree of superheat of the described indoor heat converter taken is the most unequal with described target superheat degree, then revise described target
The degree of superheat, returns described step S102, and using revised target superheat degree as in described step S104
Described target superheat degree.
Specifically, in described step S104, if the degree of superheat of the described indoor heat converter obtained is more than
The degree of superheat of the described indoor heat converter of described target superheat degree or acquisition is more than revised target superheat
Degree, then increase the aperture of described expansion valve；
If the degree of superheat of the described indoor heat converter obtained is described less than described target superheat degree or acquisition
The degree of superheat of indoor heat converter is less than revised target superheat degree, then reduce the aperture of described expansion valve.
What the above embodiment of the present invention provided prevents in multi-connected air conditioner in the method for coolant bias current, first, and will
The degree of superheat of each indoor heat converter obtained under refrigerating state compares with target superheat degree, if obtaining
The degree of superheat equal with target superheat degree, the most do not change the aperture of expansion valve；If the pipeline due to coolant flowing
The different or indoor load of resistance different, cause the degree of superheat obtained more than target superheat degree, then Indoor Thermal
Exchanger is in overload state, by increasing the aperture of expansion valve, flows through the coolant of indoor heat converter
Increase, release overload state；If the degree of superheat obtained is less than target superheat degree, then coolant may be with gas-liquid
Biphase state flows into compressor, causes damage compressor, therefore, can by reducing the aperture of expansion valve,
The flow of coolant in minimizing indoor heat converter, in order to avoid coolant flows into compressor with the coolant of gas-liquid two-phase.?
During this, have adjusted the aperture of expansion valve according to the load of indoor set and the resistance of pipeline, and then control cold
The flow of matchmaker, prevents coolant from bias current occur.
If after the aperture regulation of expansion valve is to maximum, and regulation reaches preset duration to maximum duration, obtaining
The degree of superheat still unequal with target superheat degree, now need revise target superheat degree, then by obtain
The degree of superheat compares with revised target superheat degree, and controls the aperture of expansion valve according to comparative result,
Similarly, if the degree of superheat obtained is equal with revised target superheat degree, the aperture of expansion valve is not the most changed；
If the degree of superheat obtained is more than revised target superheat degree, then increase the aperture of expansion valve；If the mistake obtained
Temperature is less than revised target superheat degree, then reduce the aperture of expansion valve.In the process, consider
The operation quantity of indoor set in multi-connected air conditioner, and fully take into account the refrigeration situation of each indoor set, and
Adjust the aperture of expansion valve, and then the flow of control coolant accordingly, prevent coolant from bias current occurring.
In sum, what the above embodiment of the present invention provided prevents the method for coolant bias current in multi-connected air conditioner
In, it is possible to consider the actual load situation of indoor set, the aperture of the expansion valve of Based Intelligent Control indoor set,
Reduce the bias current of coolant, the refrigeration of equilibrium indoor set.
In a concrete example, the described preset duration in described step S106 is 30min.
After the aperture regulation of expansion valve reaches 30min to the maximum time, the now flow of the coolant of indoor set
Steadily, the degree of superheat of indoor heat exchanger has been stablized, now can be by the degree of superheat after regulation and mesh
The mark degree of superheat compares.
In the preferred embodiment of the present invention, as it is shown in figure 1, described in prevent multi-connected air conditioner in coolant inclined
In the method for stream, also include after described step S106:
Step S108, if described target superheat degree is after the correction of preset times, the described indoor of acquisition
The degree of superheat of heat exchanger is the most unequal with through preset times revised target superheat degree, then report to the police.
If target superheat degree is after the correction of preset times, the degree of superheat of the indoor heat converter of acquisition is still
Can not be equal with revised target superheat, then explanation pipeline existing problems, now can report to the police, carry
Awake user or maintainer keep in repair so that the use quality of multi-connected air conditioner more preferably, reduces due to many
The best complaint caused of connection formula air-conditioning using effect.
In a concrete example of the present invention, described preset times is 3.
Certainly, during practical adjustments, can be according to the preset times of practical situation sets itself regulation.
In the preferred embodiment of the present invention, n-th revised target superheat degree is equal to unmodified
Described target superheat degree adds the natural number that n, n are the most described preset times.
Further, the described target superheat degree before correction is 0～5 DEG C.
When being modified target superheat degree, n-th revised target superheat degree is equal to the mesh of unmodified
The mark degree of superheat adds n, and the most each revised degree of superheat is at the existing target superheat degree (mesh of unmodified
The mark degree of superheat or the target superheat degree through revising for n-1 time) on the basis of add 1 again, wherein n is for no more than
The natural number of preset times, i.e. when the preset times revised is 3, n takes 0,1,2 or 3.
Target superheat degree before correction is 0～5 DEG C, then reach as high as 8 through 3 revised target superheat degree
℃。
In one embodiment of this invention, in described step S102, obtain once institute every Preset Time
State the degree of superheat of indoor heat converter.
Alternatively, described Preset Time is 1min.
First, the degree of superheat of an indoor heat converter is obtained every Preset Time, it is to avoid measure too frequent,
Need often to be adjusted the aperture of expansion valve, increase the workload of acquiring unit and control unit；If it is super
Cross Preset Time and measure the degree of superheat, then measure not in time, and then cause can not the bias current of coolant being carried out effectively
Ground regulation；Secondly, the aperture of expansion valve regulates after Preset Time, and the flow of the coolant of indoor set is
Tend towards stability, now can obtain the degree of superheat of indoor heat converter accurately.
Certainly, the time interval measured can suitably be adjusted, however it is not limited to above-mentioned 1min according to practical situation.
In a concrete example of the present invention, the degree of superheat of the described indoor heat converter of acquisition is described indoor
The temperature of the exit coolant of heat exchanger and the difference of the temperature of porch coolant.
By sensing chamber's inside heat exchanger outlet and the temperature of the coolant of porch, utilize the temperature of exit coolant
Degree deducts the temperature of porch coolant, can obtain the degree of superheat of indoor heat converter.
In a concrete example of the present invention, described expansion valve is electric expansion valve.
Electric expansion valve can change the setting value of the degree of superheat by changing the source code of control program, it is achieved that
Remotely, intelligentized control method, in other words, the setting of electric expansion valve, it is simple to be automatically adjusted its aperture.
As in figure 2 it is shown, the embodiment of second aspect of the present invention provides in one prevents multi-connected air conditioner cold
The system 200 of matchmaker's bias current, including:
Degree of superheat acquiring unit 202, for obtaining the mistake of each indoor heat converter of described multi-connected air conditioner
Temperature；
Regulation unit 204, compares the degree of superheat of each described indoor heat converter with target superheat degree
Relatively, when the degree of superheat and the described target superheat degree of the described indoor heat converter obtained are unequal, conditioning chamber
The aperture of the expansion valve of interior machine, makes the degree of superheat of the described indoor heat converter of acquisition and described target superheat degree
Tend to equal；With
Amending unit 204, if aperture regulation to the maximum duration of described expansion valve reaches preset duration,
The degree of superheat of the described indoor heat converter obtained is the most unequal with described target superheat degree, revises described target
The degree of superheat, and using revised target superheat degree as the described target superheat degree in described regulation unit.
What the above embodiment of the present invention provided prevents the system of coolant bias current in multi-connected air conditioner from including the degree of superheat
Acquiring unit, regulation unit and amending unit, wherein degree of superheat acquiring unit obtains each indoor heat converter
The degree of superheat, regulation unit will the degree of superheat of each indoor heat converter and the target mistake that prestores in regulation unit
Temperature compares, if the two is unequal, the expansion valve of regulation indoor set makes the two tend to equal；If it is swollen
After the aperture regulation of swollen valve is the most maximum, and regulation reaches preset duration to maximum duration, the Indoor Thermal of acquisition
The degree of superheat of exchanger is still unequal with target superheat degree, and now amending unit needs to revise target superheat
Degree, then compares the degree of superheat of the indoor heat converter of acquisition with revised target superheat degree, and
The aperture of expansion valve is controlled according to comparative result.In sum, preventing that the above embodiment of the present invention provides is many
The system of coolant bias current in connection formula air-conditioning, it is possible to consider the actual load situation of indoor set, Based Intelligent Control
The aperture of the expansion valve of indoor set, reduces the bias current of coolant.
Preferably, as in figure 2 it is shown, described in prevent the system 200 of coolant bias current in multi-connected air conditioner from also including
Alarm unit 208, if after described amending unit 206 carries out the correction of preset times to described target superheat degree,
The described degree of superheat obtained is the most unequal with through preset times revised target superheat degree, the most described list of reporting to the police
Unit 208 reports to the police.
In concrete example as shown in Figure 2, described degree of superheat acquiring unit 202 includes:
Detector unit 2022, described detector unit 2022 includes the first temperature-sensitive bag and the second temperature-sensitive bag, described
First temperature-sensitive bag is connected with the entrance of described indoor heat converter, and can detect described indoor heat converter
The temperature of porch coolant, described second temperature-sensitive bag is connected with the outlet of described indoor heat converter, and can
Detect the temperature of the exit coolant of described heat exchanger；With
Computing unit 2024, the temperature of the exit coolant calculating described indoor heat converter is cold with porch
The difference of the temperature of matchmaker, obtains the degree of superheat of described indoor heat converter.
Below in conjunction with the concrete example shown in Fig. 3, in illustrating to prevent multi-connected air conditioner described in present invention offer
The operation principle of the system of coolant bias current.
Prevent the system of coolant bias current in multi-connected air conditioner from including at least one indoor machine examination described in as it is shown on figure 3,
Survey unit 21, at least indoor set control unit 20, at least indoor set alarm unit 24 and an off-premises station
Control unit 10.
Fig. 3 illustrate only off-premises station control unit 10 and the indoor set detector unit 21 of an indoor set, indoor
Machine control unit 20, indoor set alarm unit 24 and the annexation of electronic expansion valve of indoor unit 23.
Wherein, described indoor set detector unit 21 is used for detecting at each indoor heat converter entrance and exit
The temperature of coolant；
Described indoor set control unit 20 can receive the described indoor that described indoor set detector unit 21 detects
The temperature value of the coolant in heat exchanger entrance and exit, and it is calculated the difference of the two, the most described indoor
The degree of superheat of heat exchanger；Then by the degree of superheat of described indoor heat converter and described indoor set control unit
The target superheat degree inside prestored compares, when the degree of superheat and the described target superheat of described indoor heat converter
When spending unequal, the aperture of regulation electronic expansion valve of indoor unit 22, make the described indoor heat converter of acquisition
The degree of superheat tend to equal with described target superheat degree；If the aperture of described electronic expansion valve of indoor unit 22 is adjusted
When joint to maximum duration reaches preset duration, the degree of superheat of the described indoor heat converter of acquisition and described mesh
The mark degree of superheat is the most unequal, and indoor set control unit 20 sends revision directive to off-premises station control unit 10；
Described off-premises station control unit 10 receives the revision directive that described indoor set control unit 20 sends
After, described target superheat degree is modified, and revised target superheat degree is sent to each described room
Interior machine control unit 20, as the described target superheat degree of each described indoor set control unit 20.
If after described off-premises station control unit carries out the correction of preset times to described target superheat degree, acquisition
The described degree of superheat is the most unequal with through preset times revised target superheat degree, and the most described indoor set controls single
Unit sends alarm command, makes indoor set alarm unit 208 report to the police.
Indoor set detector unit in embodiment shown in Fig. 3, indoor set control unit, off-premises station control single
Unit and indoor set alarm unit jointly act on achieve with degree of superheat acquiring unit in Fig. 2, regulation unit, repair
The function that positive unit is identical with alarm unit.
It should be noted that off-premises station control unit and indoor set control unit in embodiment illustrated in fig. 3 are equal
There are reception, analyzing and processing data and the function of transmission order.
As it is shown in figure 5, the embodiment of third aspect present invention provides a kind of multi-connected air conditioner, include
State and prevent the system of coolant bias current in multi-connected air conditioner described in any embodiment.
Specifically, as it is shown in figure 5, multi-connected air conditioner includes an off-premises station 1 and multiple indoor set 2, multiple
Indoor set 2 is connected in parallel, and is then connected in series with off-premises station 1, prevents coolant bias current in multi-connected air conditioner
The off-premises station control unit of system is disposed in the outdoor in machine 1, and indoor set control unit is disposed in the interior machine 2
In, and the aperture of electronic expansion valve of indoor unit 22 can be controlled, indoor set detector unit includes being disposed in the interior
First temperature-sensitive bag 210 of the porch of the indoor heat converter 23 of machine 2 and be disposed in the interior heat exchanger 23
The second temperature-sensitive bag 211 in exit.
Coolant bias current in multi-connected air conditioner is prevented below in conjunction with what a specific embodiment illustrated that the present invention provides
The work process of system.
Multi-connected air conditioner includes an off-premises station 1 and three indoor sets 2, and the initial target setting degree of superheat
OSHInitially=3 DEG C,
I) refrigerant temperature of the first temperature-sensitive bag 210 sensing chamber inside heat exchanger 23 porch is T1, second
The refrigerant temperature in temperature-sensitive bag 211 sensing chamber inside heat exchanger 23 exit is T2, then indoor heat converter 23
Degree of superheat SH=T2-T1；If obtaining degree of superheat SH=8 DEG C of the indoor heat exchanger of the first indoor set, the
The indoor heat converter of two indoor sets and degree of superheat SH=3 DEG C of the indoor heat converter of the 3rd indoor set, then
Electromechanics in the indoor set control unit of the second indoor set and the indoor set control unit control room of the 3rd indoor set
The aperture of sub-expansion valve 23 is constant, and in the indoor set control unit control room of the first indoor set, organic electronic expands
The aperture of valve 22 increases, if finding when again detecting after 1min, SH is still greater than OSHInitially, the most again increase
The aperture of big electric expansion valve, the aperture at electric expansion valve regulates to maximum, measures also every 1min
Obtain a SH；
II) if the aperture regulation of electric expansion valve is to maximum, and the SH obtained after 30min still greater than
OSHInitially, the most as shown in Figure 4, the indoor set control unit 20 of the first indoor set is to off-premises station control unit
10 send revision directive；
III) as shown in Figure 4, to target superheat degree after off-premises station control unit 10 receives this revision directive
It is modified, i.e. on the basis of existing target superheat degree, increases by 1 DEG C, revised target superheat degree
RSH=OSHExisting+ 1 DEG C=OSHInitially+ 1 DEG C=4 DEG C, and this revised target superheat degree RSH=4 DEG C is sent out
Give the indoor set control unit 20 of three indoor sets, the now target superheat in indoor set control unit 20
Degree becomes OSHExisting=4 DEG C；
IV) the indoor set control unit 20 of three indoor sets is with OSHExistingIt is adjusted on the basis of=4 DEG C,
And repeat above-mentioned step I) to step III) process, owing to target superheat degree now has been 4 DEG C,
Then the indoor set control unit of the second indoor set and the indoor set control unit of the 3rd indoor set control respectively
The electronic expansion valve of indoor unit of two indoor sets and the electronic expansion valve of indoor unit aperture of the 3rd indoor set reduce, and make
Degree of superheat SH of the indoor heat converter of the second indoor set and the indoor heat converter of the 3rd indoor set overheated
Degree SH becomes 4 DEG C；
The indoor set detector unit 21 of the first indoor set continues to detect an indoor heat converter every 1min
The temperature of 23 import and export coolant, indoor set control unit 20 obtains an Indoor Thermal exchange every 1min
Degree of superheat SH of device 23, and by this SH and OSHExistingCompare, if preset duration (such as 10min)
After, SH is still greater than OSHExisting, the most again send revision directive to off-premises station control unit 10；
V) when target superheat degree is modified by off-premises station control unit 10 every time, need to be in existing target
Add 1 DEG C on the basis of the degree of superheat, i.e. n-th revised target superheat degree is in the initial target mistake set
N is added, if off-premises station control unit carries out preset times (such as: three times) to target superheat degree on the basis of temperature
After correction, when the most revised target superheat degree is 6 DEG C, if obtaining now the first indoor set after 10min
Still greater than 6 DEG C, (now the aperture of the electric expansion valve of the first indoor set is maintained at the SH of indoor heat converter
Regulation is to maximum state), then this indoor set control unit 20 sends alarm command；Or, such as Fig. 4
Shown in, the SH of the indoor heat converter of the first indoor set, still greater than 6 DEG C, continues to carry out target superheat degree
Revise, RSH=7 DEG C of ＞ OSH of revised target superheat degreeInitially+ 3 DEG C, indoor set control unit 20 sends
Alarm command；
VI) carry out after indoor set alarm unit 24 receives this instruction reporting to the police (such as: alarm lamp lights, or
Person shows failure code), notify that user or this indoor set of maintainer exist fault, need to keep in repair.
It should be noted that the direction shown in arrow is the direction of transfer of data stream in Fig. 4.
In sum, what the present invention provided prevents the method for coolant bias current in multi-connected air conditioner, when due to coolant
The load that the resistance of pipeline of flowing is different or indoor is different, the indoor heat converter causing detecting overheated
When spending different from target superheat degree, inside indoor set, first carry out the adjustment of little scope, if electric expansion valve
Aperture regulated to the maximum preset time, and the degree of superheat of indoor heat converter is still different from target superheat degree,
Then revise target superheat degree, the flow of the coolant of indoor sets multiple in multi-connected air conditioner is carried out overall tune
Whole, so that the degree of superheat of each indoor heat converter is identical with target superheat degree, if repairing through preset times
After the positive goal degree of superheat, the degree of superheat of indoor heat converter is still different, then from revised target superheat degree
Alarm module is reported to the police, and notifies that indoor set is adjusted by user or maintainer.In brief, the present invention carries
Confession prevent the method for coolant bias current in multi-connected air conditioner, it is possible to consider the actual load feelings of indoor set
Condition, the aperture of Based Intelligent Control expansion valve, reduce the bias current of coolant, the refrigeration of equilibrium indoor set.
In describing the invention, term " connects " etc. and all should be interpreted broadly, and such as, " connection " can
To be fixing connection, it is also possible to be to removably connect, or be integrally connected, or electrical connection；Can be direct
It is connected, it is also possible to be indirectly connected to by intermediary.For the ordinary skill in the art, permissible
Understand above-mentioned term concrete meaning in the present invention as the case may be.
In the description of this specification, term " embodiment ", " some embodiments ", " specific embodiment "
Deng description means to combine this embodiment or example describes specific features, structure, material or feature be contained in
In at least one embodiment of the present invention or example.In this manual, the schematic representation to above-mentioned term
It is not necessarily referring to identical embodiment or example.And, the specific features of description, structure, material or spy
Point can combine in any one or more embodiments or example in an appropriate manner.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for ability
For the technical staff in territory, the present invention can have various modifications and variations.All in the spirit and principles in the present invention
Within, any modification, equivalent substitution and improvement etc. made, should be included in protection scope of the present invention it
In.
Claims (12)
1. prevent a method for coolant bias current in multi-connected air conditioner, including:
Step S102, obtains the degree of superheat of each indoor heat converter of described multi-connected air conditioner；
Step S104, compares the degree of superheat of each described indoor heat converter with target superheat degree,
When the degree of superheat of the described indoor heat converter obtained is unequal with described target superheat degree, regulate indoor set
The aperture of expansion valve, make the degree of superheat of the described indoor heat converter of acquisition tend to described target superheat degree
Equal；
It is characterized in that, further comprising the steps of:
Step S106, if aperture regulation to the maximum duration of described expansion valve reaches preset duration, obtains
The degree of superheat of the described indoor heat converter taken is the most unequal with described target superheat degree, then revise described target
The degree of superheat, returns described step S102, and using revised target superheat degree as in described step S104
Described target superheat degree.
The most according to claim 1 preventing the method for coolant bias current in multi-connected air conditioner, its feature exists
In, also include after described step S106:
Step S108, if described target superheat degree is after the correction of preset times, the described indoor of acquisition
The degree of superheat of heat exchanger is the most unequal with through preset times revised target superheat degree, then report to the police.
The most according to claim 2 preventing the method for coolant bias current in multi-connected air conditioner, its feature exists
In,
Described preset times is 3.
The most according to claim 3 preventing the method for coolant bias current in multi-connected air conditioner, its feature exists
In,
It is not that n-th revised target superheat degree adds n, n equal to the described target superheat degree of unmodified
Natural number more than described preset times.
The most according to any one of claim 1 to 4 prevent the side of coolant bias current in multi-connected air conditioner
Method, it is characterised in that in described step S104,
If the degree of superheat of the described indoor heat converter obtained is described more than described target superheat degree or acquisition
The degree of superheat of indoor heat converter is more than revised target superheat degree, then increase the aperture of described expansion valve；
If the degree of superheat of the described indoor heat converter obtained is described less than described target superheat degree or acquisition
The degree of superheat of indoor heat converter is less than revised target superheat degree, then reduce the aperture of described expansion valve.
The most according to claim 5 preventing the method for coolant bias current in multi-connected air conditioner, its feature exists
In,
In described step S102, obtain the degree of superheat of the most described indoor heat converter every Preset Time.
The most according to claim 6 preventing the method for coolant bias current in multi-connected air conditioner, its feature exists
In,
The degree of superheat of described indoor heat converter be the exit coolant of described indoor heat converter temperature with
The difference of the temperature of porch coolant.
The most according to claim 5 preventing the method for coolant bias current in multi-connected air conditioner, its feature exists
In,
Described target superheat degree before correction is 0～5 DEG C.
9. prevent a system for coolant bias current in multi-connected air conditioner, including:
Degree of superheat acquiring unit, for obtaining the overheated of each indoor heat converter of described multi-connected air conditioner
Degree；
Regulation unit, compares the degree of superheat of each described indoor heat converter with target superheat degree, when
When the degree of superheat of the described indoor heat converter obtained is unequal with described target superheat degree, regulation indoor set
The aperture of expansion valve, makes the degree of superheat of the described indoor heat converter of acquisition tend to phase with described target superheat degree
Deng；
It is characterized in that, also include:
Amending unit, if aperture regulation to the maximum duration of described expansion valve reaches preset duration, obtains
The degree of superheat of described indoor heat converter the most unequal with described target superheat degree, revise described target superheat
Degree, and using revised target superheat degree as the described target superheat degree in described regulation unit.
The most according to claim 9 preventing the system of coolant bias current in multi-connected air conditioner, its feature exists
In, also include:
Alarm unit, if after described amending unit carries out the correction of preset times to described target superheat degree, obtaining
The described degree of superheat taken is the most unequal with through preset times revised target superheat degree, the most described alarm unit
Report to the police.
11. according to preventing the system of coolant bias current in multi-connected air conditioner described in claim 9 or 10, its
Being characterised by, described degree of superheat acquiring unit includes:
Detector unit, described detector unit includes the first temperature-sensitive bag and the second temperature-sensitive bag, described first temperature-sensitive bag
It is connected with the entrance of described indoor heat converter, and the porch coolant of described indoor heat converter can be detected
Temperature, described second temperature-sensitive bag is connected with the outlet of described indoor heat converter, and can detect described room
The temperature of the exit coolant of inside heat exchanger；With
Computing unit, calculates the temperature of the exit coolant of described indoor heat converter and the temperature of porch coolant
The difference of degree, obtains the degree of superheat of described indoor heat converter.
12. 1 kinds of multi-connected air conditioners, it is characterised in that including:
The system of coolant bias current in multi-connected air conditioner is prevented as according to any one of claim 9 to 11.
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| CN110822635B (en) * | 2019-09-26 | 2020-12-29 | 宁波工程学院 | Dynamic control method of electronic expansion valve during refrigeration of capillary radiation air conditioner |
| CN110762642B (en) * | 2019-10-09 | 2022-05-20 | 青岛海尔空调电子有限公司 | Outdoor heat exchanger, air conditioning system and control method of air conditioning system |
| CN113465240B (en) * | 2021-06-29 | 2022-11-01 | 青岛海信日立空调系统有限公司 | Refrigerant filling method and device |
| CN114484733B (en) * | 2022-01-26 | 2023-07-21 | 宁波奥克斯电气股份有限公司 | Expansion valve control method and device and air conditioning system |
| CN114688689B (en) * | 2022-03-31 | 2023-08-11 | 安徽奥克斯智能电气有限公司 | Opening degree adjusting method and device of electronic expansion valve and multi-connected air conditioner |
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