CN103982987A - Method and system for preventing bias flowing of refrigerant in multi-split air conditioner and multi-split air conditioner - Google Patents
Method and system for preventing bias flowing of refrigerant in multi-split air conditioner and multi-split air conditioner Download PDFInfo
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- CN103982987A CN103982987A CN201410191178.9A CN201410191178A CN103982987A CN 103982987 A CN103982987 A CN 103982987A CN 201410191178 A CN201410191178 A CN 201410191178A CN 103982987 A CN103982987 A CN 103982987A
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Abstract
The invention provides a method and a system for preventing bias flowing of a refrigerant in a multi-split air conditioner and the multi-split air conditioner. The method for preventing the bias flowing of the refrigerant in the multi-split air conditioner comprises the steps of obtaining the superheating degree of each indoor heat exchanger; comparing the obtained superheating degree with the target superheating degree, adjusting the open degree of an expansion valve when the obtained superheating degree is not equal to the target superheating degree, and enabling the superheating degree of each indoor heat exchanger to tend to be equal to the target superheating degree; correcting the target superheating degree if the superheating degree of each indoor heat exchanger is still not equal to the target superheating degree when the maximum time for adjusting the open degree of the expansion valve is up to a preset time, and then adjusting the open degree of the expansion valve according to a comparison result of the superheating degree of each indoor heat exchanger and the corrected target superheating degree. According to the method for preventing the bias flowing of the refrigerant in the multi-split air conditioner, provided by the invention, the engineering installation situation and the actual load of indoor units are comprehensively considered, the open degree of an electronic expansion valve can be intelligently controlled, the bias flowing of the refrigerant is reduced, and the refrigerating effect of the indoor units is balanced.
Description
Technical field
The present invention relates to art of refrigeration units, more specifically, relate to a kind of method that prevents refrigerant bias current in multi-connected air conditioner, prevent system and a kind of multi-connected air conditioner of refrigerant bias current in multi-connected air conditioner.
Background technology
Drag in many multiple central air conditioner devices (connecting multiple indoor sets on an off-premises station) one, how to reduce under refrigerating state the bias current of refrigerant, the refrigeration of balanced indoor set in indoor set is problem very deeply concerned in the industry always.Indoor set has more and more adopted degree of superheat control technology at present, this has alleviated the unbalanced phenomenon of refrigeration of indoor set to a certain extent, but multiple central air conditioner device is in the installation situation more complicated of Practical Project, the problems such as the long and pipe arrangement caliber of the pipe arrangement that for example has long pipe arrangement, high drop or cause due to type selecting mistake is less than normal, all may aggravate the bias current of indoor set.
For this reason, in correlation technique, there are two kinds of solutions, wherein first method is: the benchmark degree of superheat of revising indoor set to move the quantity of indoor set, the indoor set quantity of operation makes the benchmark degree of superheat of each indoor set less more, and the fewer benchmark degree of superheat of each indoor set that makes of indoor set quantity of operation is larger; Second method is: according to the aperture of length of pipe judgement and correction indoor set electric expansion valve, thereby revise the degree of superheat.
But above-mentioned two kinds of equal existent defects of method: above-mentioned two kinds of methods are just merely according to the aperture of the length control electric expansion valve of the operation quantity of indoor set or pipeline, and can not consider project installation situation and the actual load of indoor set, the aperture of Based Intelligent Control electronics expansion valve, reduces the bias current of refrigerant.
Summary of the invention
The present invention is intended at least solve one of technical problem existing in prior art.
For this reason, the object of first aspect of the present invention is, a kind of method that prevents refrigerant bias current in multi-connected air conditioner is provided, and can consider project installation situation and the actual load of indoor set, and the aperture of Based Intelligent Control electronics expansion valve, reduces the bias current of refrigerant.
The object of second aspect of the present invention is, a kind of system that prevents refrigerant bias current in multi-connected air conditioner is provided.
The object of third aspect of the present invention is, a kind of above-mentioned multi-connected air conditioner that prevents the system of refrigerant bias current in multi-connected air conditioner that has is provided.
For achieving the above object, the embodiment of first aspect of the present invention provides a kind of method that prevents refrigerant bias current in multi-connected air conditioner, comprises the following steps: step S102, obtains the degree of superheat of each indoor heat converter of described multi-connected air conditioner; Step S104, the degree of superheat of indoor heat converter described in each and the target degree of superheat are compared, when the degree of superheat of the described indoor heat converter obtaining and the described target degree of superheat are when unequal, the aperture that regulates the expansion valve of indoor set, makes the degree of superheat of the described indoor heat converter obtaining be tending towards equating with the described target degree of superheat; Step S106, if when the regulation of described expansion valve to maximum duration reaches default duration, the degree of superheat of the described indoor heat converter obtaining and the described target degree of superheat are still unequal, revise the described target degree of superheat, return to described step S102, and using the revised target degree of superheat the described target degree of superheat in described step S104.
What the above embodiment of the present invention provided prevents in the method for refrigerant bias current in multi-connected air conditioner, first, the degree of superheat of each indoor heat converter obtaining under refrigerating state and the target degree of superheat are compared, if the degree of superheat of the indoor heat converter obtaining equates with the target degree of superheat, does not change the aperture of expansion valve; If the degree of superheat of the indoor heat converter obtaining is greater than the target degree of superheat, indoor heat converter is in overload state, and by increasing the aperture of expansion valve, the refrigerant of the indoor heat converter that makes to flow through increases, and removes overload state; If the degree of superheat of the indoor heat converter obtaining is less than the target degree of superheat, refrigerant may flow into compressor with the state of gas-liquid two-phase, compressor is caused damage, therefore, can be by reducing the aperture of expansion valve, reduce the flow of refrigerant in indoor heat converter, in order to avoid refrigerant flows into compressor with the refrigerant of gas-liquid two-phase.In this process, according to the load adjustment of indoor set the aperture of expansion valve, and then control the flow of refrigerant, prevent that bias current from appearring in refrigerant.
If the regulation of expansion valve is to maximum, and being adjusted to maximum duration reaches after default duration, the degree of superheat of the indoor heat converter obtaining is still unequal with the target degree of superheat, now need the revise goal degree of superheat, then the degree of superheat of the indoor heat converter obtaining and the revised target degree of superheat are compared, and according to the aperture of comparative result control expansion valve, similarly, if the degree of superheat of obtaining equates with the revised target degree of superheat, does not change the aperture of expansion valve; If the degree of superheat of obtaining is greater than the revised target degree of superheat, increase the aperture of expansion valve; If the degree of superheat of obtaining is less than the revised target degree of superheat, reduce the aperture of expansion valve.In this process, fully take into account the refrigeration situation of each indoor set, and adjust accordingly the aperture of expansion valve, and then control the flow of refrigerant, prevent that bias current from appearring in refrigerant.
In sum, what the above embodiment of the present invention provided prevents from, in the method for refrigerant bias current in multi-connected air conditioner, can considering the actual load situation of indoor set, and the aperture of the expansion valve of Based Intelligent Control indoor set, reduces the bias current of refrigerant.
In addition, the method that prevents refrigerant bias current in multi-connected air conditioner providing according to the above embodiment of the present invention also has following additional technical feature:
According to one embodiment of present invention, after described step S106, also comprise: step S108, if the described target degree of superheat is after the correction of preset times, the degree of superheat of the described indoor heat converter obtaining, with still unequal through the revised target degree of superheat of preset times, is reported to the police.
According to one embodiment of present invention, described preset times is 3.
According to one embodiment of present invention, the described target degree of superheat that the n time revised target degree of superheat equals unmodified adds n, and n is the natural number that is not more than described preset times.
According to one embodiment of present invention, in described step S104, if the degree of superheat of the described indoor heat converter obtaining is greater than the described target degree of superheat or the degree of superheat of the described indoor heat converter that obtains is greater than the revised target degree of superheat, increase the aperture of described expansion valve; If the degree of superheat of the described indoor heat converter obtaining is less than the described target degree of superheat or the degree of superheat of the described indoor heat converter that obtains is less than the revised target degree of superheat, reduce the aperture of described expansion valve.
According to one embodiment of present invention, in described step S102, obtain once the degree of superheat of described indoor heat converter every Preset Time.
According to one embodiment of present invention, the temperature of exit refrigerant that the degree of superheat of described indoor heat converter is described indoor heat converter and the difference of the temperature of porch refrigerant.
According to one embodiment of present invention, the described target degree of superheat before correction is 0～5 DEG C.
The embodiment of second aspect of the present invention provides a kind of system that prevents refrigerant bias current in multi-connected air conditioner, comprising: degree of superheat acquiring unit, for obtaining the degree of superheat of each indoor heat converter of described multi-connected air conditioner; Regulon, the degree of superheat of indoor heat converter described in each and the target degree of superheat are compared, when the degree of superheat of the described indoor heat converter obtaining and the described target degree of superheat are when unequal, the aperture that regulates the expansion valve of indoor set, makes the degree of superheat of the described indoor heat converter obtaining be tending towards equating with the described target degree of superheat; And amending unit, if when the regulation of described expansion valve to maximum duration reaches default duration, the degree of superheat of the described indoor heat converter obtaining and the described target degree of superheat are still unequal, revise the described target degree of superheat, and using the revised target degree of superheat the described target degree of superheat in described regulon.
In addition, the system that prevents refrigerant bias current in multi-connected air conditioner providing according to the above embodiment of the present invention also has following additional technical feature:
According to one embodiment of present invention, the described system that prevents refrigerant bias current in multi-connected air conditioner also comprises alarm unit, if described amending unit carries out after the correction of preset times the described target degree of superheat, the described degree of superheat of obtaining is with still unequal through the revised target degree of superheat of preset times, and described alarm unit is reported to the police.
According to one embodiment of present invention, described degree of superheat acquiring unit comprises: detecting unit, described detecting unit comprises the first temperature-sensitive bag and the second temperature-sensitive bag, described the first temperature-sensitive bag is connected with the entrance of described indoor heat converter, and can detect the temperature of the porch refrigerant of described indoor heat converter, described the second temperature-sensitive bag is connected with the outlet of described indoor heat converter, and can detect the temperature of the exit refrigerant of described heat exchanger; And computing unit, calculate the temperature of exit refrigerant of described indoor heat converter and the difference of the temperature of porch refrigerant, obtain 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 the system that prevents refrigerant bias current in multi-connected air conditioner described in above-mentioned arbitrary embodiment.
Additional aspect of the present invention and advantage will become in description part below obviously, or recognize by practice of the present invention.
Brief description of the drawings
Above-mentioned and/or additional aspect of the present invention and advantage accompanying drawing below combination is understood becoming the description of embodiment obviously and easily, wherein:
Fig. 1 is according to the flow chart that prevents the method for refrigerant bias current in multi-connected air conditioner described in one embodiment of the invention;
Fig. 2 is according to the schematic block diagram that prevents the system of refrigerant bias current in multi-connected air conditioner described in one embodiment of the invention;
Fig. 3 is according to the schematic block diagram that prevents the system of refrigerant bias current in multi-connected air conditioner described in another embodiment of the present invention;
Fig. 4 is the operation principle schematic diagram that prevents the system of refrigerant bias current in multi-connected air conditioner shown in Fig. 3;
Fig. 5 is according to the structural representation of the multi-connected air conditioner described in one embodiment of the invention.
Wherein, in Fig. 2 to Fig. 5, the corresponding relation between Reference numeral and component names is:
1 off-premises station, 10 off-premises station control modules, 2 indoor sets, 20 indoor set control modules,
21 indoor set detecting units, 210 first temperature-sensitive bags, 211 second temperature-sensitive bags,
22 indoor set electric expansion valves, 23 indoor heat converters, 24 indoor set alarm units,
200 prevent the system of refrigerant bias current in multi-connected air conditioner, 202 acquiring units, and 2022 detecting units,
2024 computing units, 204 regulons, 206 amending units, 208 alarm units
Detailed description of the invention
In order more clearly to understand above-mentioned purpose of the present invention, feature and advantage, below in conjunction with the drawings and specific embodiments, the present invention is further described in detail.It should be noted that, in the situation that not conflicting, the feature in the application's embodiment and embodiment can combine mutually.
A lot of details are set forth in the following description so that fully understand the present invention; but; the present invention can also adopt other to be different from mode described here and implement, and therefore, protection scope of the present invention is not subject to the restriction of following public specific embodiment.
Describe with reference to the accompanying drawings the method that prevents refrigerant bias current in multi-connected air conditioner according to some embodiments of the invention, prevent system and the multi-connected air conditioner of refrigerant bias current in multi-connected air conditioner.
As shown in Figure 1, a kind of method that prevents refrigerant bias current in multi-connected air conditioner providing according to some embodiments of the invention, comprises the following steps:
Step S102, obtains the degree of superheat of each indoor heat converter of described multi-connected air conditioner;
Step S104, the degree of superheat of indoor heat converter described in each and the target degree of superheat are compared, when the degree of superheat of the described indoor heat converter obtaining and the target degree of superheat are when unequal, the aperture that regulates the expansion valve of indoor set, makes the degree of superheat of the described indoor heat converter obtaining be tending towards equating with the described target degree of superheat;
Step S106, if when the regulation of described expansion valve to maximum duration reaches default duration, the degree of superheat of the described indoor heat converter obtaining and the described target degree of superheat are still unequal, revise the described target degree of superheat, return to described step S102, and using the revised target degree of superheat the described target degree of superheat in described step S104.
Particularly, in described step S104, if the degree of superheat of the described indoor heat converter obtaining is greater than the described target degree of superheat or the degree of superheat of the described indoor heat converter that obtains is greater than the revised target degree of superheat, increase the aperture of described expansion valve;
If the degree of superheat of the described indoor heat converter obtaining is less than the described target degree of superheat or the degree of superheat of the described indoor heat converter that obtains is less than the revised target degree of superheat, reduce the aperture of described expansion valve.
What the above embodiment of the present invention provided prevents in the method for refrigerant bias current in multi-connected air conditioner, first, the degree of superheat of each indoor heat converter obtaining under refrigerating state and the target degree of superheat are compared, if the degree of superheat of obtaining equate with the target degree of superheat, do not change the aperture of expansion valve; If due to resistance difference or the indoor load difference of the mobile pipeline of refrigerant, cause the degree of superheat of obtaining to be greater than the target degree of superheat, indoor heat converter is in overload state, by increasing the aperture of expansion valve, the refrigerant of indoor heat converter of making to flow through increases, and removes overload state; If the degree of superheat of obtaining is less than the target degree of superheat, refrigerant may flow into compressor with the state of gas-liquid two-phase, and compressor is caused damage, therefore, can, by reducing the aperture of expansion valve, reduce the flow of refrigerant in indoor heat converter, in order to avoid refrigerant flows into compressor with the refrigerant of gas-liquid two-phase.In this process, adjust the aperture of expansion valve according to the resistance of the load of indoor set and pipeline, and then controlled the flow of refrigerant, prevent that bias current from appearring in refrigerant.
If the regulation of expansion valve is to maximum, and being adjusted to maximum duration reaches after default duration, the degree of superheat of obtaining is still unequal with the target degree of superheat, now need the revise goal degree of superheat, then the degree of superheat of obtaining and the revised target degree of superheat are compared, and according to the aperture of comparative result control expansion valve, similarly, if the degree of superheat of obtaining equates with the revised target degree of superheat, does not change the aperture of expansion valve; If the degree of superheat of obtaining is greater than the revised target degree of superheat, increase the aperture of expansion valve; If the degree of superheat of obtaining is less than the revised target degree of superheat, reduce the aperture of expansion valve.In this 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 accordingly the aperture of expansion valve, and then control the flow of refrigerant, prevent that bias current from appearring in refrigerant.
In sum, what the above embodiment of the present invention provided prevents from, in the method for refrigerant bias current in multi-connected air conditioner, can considering the actual load situation of indoor set, the aperture of the expansion valve of Based Intelligent Control indoor set, reduce the bias current of refrigerant, the refrigeration of balanced indoor set.
In a concrete example, the described default duration in described step S106 is 30min.
The regulation of expansion valve to the maximum time reaches after 30min, and now the flow of the refrigerant of indoor set is steady, and the degree of superheat of indoor heat exchanger is also stable, now can will regulate the degree of superheat and the target degree of superheat later to compare.
In a preferred embodiment of the present invention, as shown in Figure 1, described in prevent from, in the method for refrigerant bias current in multi-connected air conditioner, after described step S106, also comprising:
Step S108, if the described target degree of superheat after the correction of preset times, the degree of superheat of the described indoor heat converter obtaining with still unequal through the revised target degree of superheat of preset times, report to the police.
If the target degree of superheat is after the correction of preset times, the degree of superheat of the indoor heat converter obtaining still can not with overheated the equating of revised target, pipeline existing problems are described, now can report to the police, reminding user or maintenance personal keep in repair, make the using character of multi-connected air conditioner better, reduce due to the not good complaint causing of multi-connected air conditioner result of use.
In of the present invention one concrete example, described preset times is 3.
Certainly,, in practical adjustments process, can set voluntarily according to actual conditions the preset times of adjusting.
In a preferred embodiment of the present invention, the described target degree of superheat that the n time revised target degree of superheat equals unmodified adds n, and n is the natural number that is not more than described preset times.
Further, the described target degree of superheat before correction is 0～5 DEG C.
When the target degree of superheat is revised, the target degree of superheat that the n time revised target degree of superheat equals unmodified adds n, be that each revised degree of superheat is for adding 1 on the basis in the existing target degree of superheat (the target degree of superheat of unmodified or the target degree of superheat through n-1 correction) again, wherein n is the natural number that is not more than preset times, in the time that the preset times of revising is 3, n gets 0,1, and 2 or 3.
The target degree of superheat before correction is 0～5 DEG C, reaches as high as 8 DEG C through 3 revised target degrees of superheat.
In one embodiment of this invention, in described step S102, obtain once the degree of superheat of described indoor heat converter every Preset Time.
Alternatively, described Preset Time is 1min.
First, obtain the degree of superheat of an indoor heat converter every Preset Time, avoid measurement too frequent, need to often carry out the aperture of variable expansion valve, strengthened the workload of acquiring unit and control module; Measure the degree of superheat if exceed Preset Time, measure not in time, and then cause effectively regulating the bias current of refrigerant; Secondly, the regulation of expansion valve is after Preset Time, and the flow of the refrigerant of indoor set tends towards stability, and now can obtain accurately the degree of superheat of indoor heat converter.
Certainly, can, according to actual conditions, suitably adjust the time interval of measuring, be not limited to above-mentioned 1min.
In of the present invention one concrete example, the difference of the temperature of the exit refrigerant that the degree of superheat of the described indoor heat converter obtaining is described indoor heat converter and the temperature of porch refrigerant.
The temperature of the refrigerant by heat exchanger outlet in sensing chamber and porch, utilizes the temperature of exit refrigerant to deduct the temperature of porch refrigerant, can obtain the degree of superheat of indoor heat converter.
In of the present invention one concrete example, described expansion valve is electric expansion valve.
The setting value that electric expansion valve can change by changing the source code of control program the degree of superheat, has realized long-range, intelligent control, and in other words, the setting of electric expansion valve, is convenient to automatically regulate its aperture.
As shown in Figure 2, the embodiment of second aspect of the present invention provides a kind of system 200 that prevents refrigerant bias current in multi-connected air conditioner, comprising:
Degree of superheat acquiring unit 202, for obtaining the degree of superheat of each indoor heat converter of described multi-connected air conditioner;
Regulon 204, the degree of superheat of indoor heat converter described in each and the target degree of superheat are compared, when the degree of superheat of the described indoor heat converter obtaining and the described target degree of superheat are when unequal, the aperture that regulates the expansion valve of indoor set, makes the degree of superheat of the described indoor heat converter obtaining be tending towards equating with the described target degree of superheat; With
Amending unit 204, if when the regulation of described expansion valve to maximum duration reaches default duration, the degree of superheat of the described indoor heat converter obtaining and the described target degree of superheat are still unequal, revise the described target degree of superheat, and using the revised target degree of superheat the described target degree of superheat in described regulon.
What the above embodiment of the present invention provided prevents that the system of refrigerant bias current in multi-connected air conditioner from comprising degree of superheat acquiring unit, regulon and amending unit, wherein degree of superheat acquiring unit is obtained the degree of superheat of each indoor heat converter, regulon compares the target degree of superheat prestoring in the degree of superheat of each indoor heat converter and regulon, if when the two is unequal, regulate the expansion valve of indoor set to make the two be tending towards equal; If the regulation of expansion valve is to maximum, and being adjusted to maximum duration reaches after default duration, the degree of superheat of the indoor heat converter obtaining is still unequal with the target degree of superheat, now amending unit needs the revise goal degree of superheat, then the degree of superheat of the indoor heat converter obtaining and the revised target degree of superheat are compared, and according to the aperture of comparative result control expansion valve.In sum, the system of refrigerant bias current in what the above embodiment of the present invention provided prevent multi-connected air conditioner, can consider the actual load situation of indoor set, and the aperture of the expansion valve of Based Intelligent Control indoor set, reduces the bias current of refrigerant.
Preferably, as shown in Figure 2, the described system 200 that prevents refrigerant bias current in multi-connected air conditioner also comprises alarm unit 208, if described amending unit 206 carries out after the correction of preset times the described target degree of superheat, the described degree of superheat of obtaining is with still unequal through the revised target degree of superheat of preset times, and described alarm unit 208 is reported to the police.
In concrete example as shown in Figure 2, described degree of superheat acquiring unit 202 comprises:
Detecting unit 2022, described detecting unit 2022 comprises the first temperature-sensitive bag and the second temperature-sensitive bag, described the first temperature-sensitive bag is connected with the entrance of described indoor heat converter, and can detect the temperature of the porch refrigerant of described indoor heat converter, described the second temperature-sensitive bag is connected with the outlet of described indoor heat converter, and can detect the temperature of the exit refrigerant of described heat exchanger; With
Computing unit 2024, calculates the temperature of exit refrigerant of described indoor heat converter and the difference of the temperature of porch refrigerant, obtains the degree of superheat of described indoor heat converter.
Below in conjunction with the concrete example shown in Fig. 3, the operation principle that prevents the system of refrigerant bias current in multi-connected air conditioner described in provided by the invention is described.
As shown in Figure 3, the system that prevents refrigerant bias current in multi-connected air conditioner described in comprises at least one indoor set detecting unit 21, at least one indoor set control module 20, at least one indoor set alarm unit 24 and an off-premises station control module 10.
Fig. 3 only shows the annexation of indoor set detecting unit 21, indoor set control module 20, indoor set alarm unit 24 and the indoor set electric expansion valve 23 of off-premises station control module 10 and an indoor set.
Wherein, described indoor set detecting unit 21 is for detection of the temperature of the refrigerant at each indoor heat converter entrance and exit place;
Described indoor set control module 20 can receive the temperature value of the refrigerant at the described indoor heat converter entrance and exit place that described indoor set detecting unit 21 detects, and calculates the difference of the two, the i.e. degree of superheat of described indoor heat converter; Then the target degree of superheat prestoring in the degree of superheat of described indoor heat converter and described indoor set control module is compared, when the degree of superheat of described indoor heat converter and the described target degree of superheat are when unequal, in conditioning chamber, the aperture of organic electronic expansion valve 22, makes the degree of superheat of the described indoor heat converter obtaining be tending towards equating with the described target degree of superheat; If when the regulation of described indoor set electric expansion valve 22 to maximum duration reaches default duration, the degree of superheat of the described indoor heat converter obtaining and the described target degree of superheat are still unequal, and indoor set control module 20 sends revision directive to off-premises station control module 10;
Described off-premises station control module 10 receives after the revision directive that described indoor set control module 20 sends, the described target degree of superheat is revised, and the revised target degree of superheat is sent to indoor set control module 20 described in each, as the described target degree of superheat of indoor set control module 20 described in each.
If described off-premises station control module carries out after the correction of preset times the described target degree of superheat, the described degree of superheat of obtaining is with still unequal through the revised target degree of superheat of preset times, described indoor set control module sends alarm command, and indoor set alarm unit 208 is reported to the police.
Indoor set detecting unit, indoor set control module, off-premises station control module and the acting in conjunction of indoor set alarm unit in embodiment shown in Fig. 3 realized the identical function with degree of superheat acquiring unit, regulon, amending unit and alarm unit in Fig. 2.
It should be noted that, the off-premises station control module in embodiment illustrated in fig. 3 and indoor set control module all have the function of reception, analyzing and processing data and transmission order.
As shown in Figure 5, the embodiment of third aspect present invention provides a kind of multi-connected air conditioner, includes the system that prevents refrigerant bias current in multi-connected air conditioner described in above-mentioned arbitrary embodiment.
Particularly, as shown in Figure 5, multi-connected air conditioner comprises an off-premises station 1 and multiple indoor set 2, multiple indoor sets 2 are connected in parallel, then be connected in series with off-premises station 1, the off-premises station control module that prevents the system of refrigerant bias current in multi-connected air conditioner is arranged in off-premises station 1, indoor set control module is arranged in indoor set 2, and can control the aperture of indoor set electric expansion valve 22, indoor set detecting unit comprise the indoor heat converter 23 that is arranged on indoor set 2 porch the first temperature-sensitive bag 210 and be arranged on the second temperature-sensitive bag 211 in the exit of indoor heat converter 23.
Below in conjunction with a specific embodiment, the course of work that prevents the system of refrigerant bias current in multi-connected air conditioner provided by the invention is described.
Multi-connected air conditioner comprises an off-premises station 1 and three indoor sets 2, and initial setting target degree of superheat OSH
initially=3 DEG C,
I) to detect the refrigerant temperature of indoor heat converter 23 porch be T1 to the first temperature-sensitive bag 210, and the refrigerant temperature that the second temperature-sensitive bag 211 detects indoor heat converter 23 exits is T2, the degree of superheat SH=T2-T1 of indoor heat converter 23; If obtain the degree of superheat SH=8 DEG C of the indoor heat exchanger of the first indoor set, the degree of superheat SH=3 DEG C of the indoor heat converter of the indoor heat converter of the second indoor set and the 3rd indoor set, in the indoor set control module control room of the indoor set control module of the second indoor set and the 3rd indoor set, the aperture of organic electronic expansion valve 23 is constant, in the indoor set control module control room of the first indoor set, the aperture of organic electronic expansion valve 22 increases, if find while again detection after 1min, SH is still greater than OSH
initially, again increase the aperture of electric expansion valve, to maximum, measure and obtain one time SH every 1min at the regulation of electric expansion valve;
II) if the regulation of electric expansion valve is extremely maximum, and the SH obtaining after 30min is still greater than OSH
initially, as shown in Figure 4, the indoor set control module 20 of the first indoor set sends revision directive to off-premises station control module 10;
III) as shown in Figure 4, off-premises station control module 10 is revised the target degree of superheat after receiving this revision directive, on the basis of the existing target degree of superheat, increases by 1 DEG C, revised target degree of superheat RSH=OSH
existing+ 1 DEG C=OSH
initially+ 1 DEG C=4 DEG C, and RSH=4 DEG C of this revised target degree of superheat sent to the indoor set control module 20 of three indoor sets, now the target degree of superheat in indoor set control module 20 becomes OSH
existing=4 DEG C;
IV) the indoor set control module 20 of three indoor sets is with OSH
existing=4 DEG C regulate for benchmark, and repeat above-mentioned step I) to Step II I) process, because the target degree of superheat has now been 4 DEG C, the indoor set control module of the indoor set control module of the second indoor set and the 3rd indoor set is controlled respectively the indoor set electric expansion valve of the second indoor set and the indoor set electronic expansion valve opening of the 3rd indoor set reduces, and makes the degree of superheat SH of indoor heat converter of the second indoor set and the degree of superheat SH of the indoor heat converter of the 3rd indoor set become 4 DEG C;
The indoor set detecting unit 21 of the first indoor set continues to detect every 1min the temperature of indoor heat converter 23 import and export refrigerants, and indoor set control module 20 obtains the degree of superheat SH of an indoor heat converter 23 every 1min, and by this SH and OSH
existingcompare, if after default duration (as 10min), SH is still greater than OSH
existing, again send revision directive to off-premises station control module 10;
V) when off-premises station control module 10 is revised the target degree of superheat at every turn, need on the basis of the existing target degree of superheat, add 1 DEG C, the n time revised target degree of superheat is to add n on the basis of the target degree of superheat of initial setting, if off-premises station control module carries out after preset times (as: three times) correction the target degree of superheat, be that the revised target degree of superheat is while being 6 DEG C, still be greater than 6 DEG C (now the aperture of the electric expansion valve of the first indoor set remains on the maximum state that is adjusted to) if obtain the now SH of the indoor heat converter of the first indoor set after 10min, this indoor set control module 20 sends alarm command, or as shown in Figure 4, the SH of the indoor heat converter of the first indoor set is still greater than 6 DEG C, continue the target degree of superheat to revise RSH=7 DEG C of > OSH of the revised target degree of superheat
initially+ 3 DEG C, indoor set control module 20 sends alarm command,
VI) indoor set alarm unit 24 is reported to the police after receiving this instruction (as: alarm lamp lights, or shows failure code), notifies this indoor set of user or maintenance personal to have fault, need keep in repair.
It should be noted that the direction of transfer that the direction in Fig. 4 shown in arrow is data flow.
In sum, the method that prevents refrigerant bias current in multi-connected air conditioner provided by the invention, when the resistance due to the mobile pipeline of refrigerant is different or indoor load difference, while causing the degree of superheat of the indoor heat converter detecting different from the target degree of superheat, first carry out adjustment among a small circle in indoor set inside, if the regulation of electric expansion valve is to the maximum preset time, the degree of superheat of indoor heat converter is still different from the target degree of superheat, the revise goal degree of superheat, the flow of the refrigerant to multiple indoor sets in multi-connected air conditioner carries out overall adjustment, so that the degree of superheat of each indoor heat converter is identical with the target degree of superheat, if after the revise goal degree of superheat of preset times, the degree of superheat of indoor heat converter is still different from the revised target degree of superheat, alarm module is reported to the police, notify user or maintenance personal to adjust indoor set.In brief, the method that prevents refrigerant bias current in multi-connected air conditioner provided by the invention, can consider the actual load situation of indoor set, and the aperture of Based Intelligent Control expansion valve, reduces the bias current of refrigerant, the refrigeration of balanced indoor set.
In description of the invention, term " connection " etc. all should be interpreted broadly, and for example, " connection " can be to be fixedly connected with, and can be also to removably connect, or connects integratedly, or electrical connection; Can be to be directly connected, also can indirectly be connected by intermediary.For the ordinary skill in the art, can understand as the case may be above-mentioned term concrete meaning in the present invention.
In the description of this description, the description of term " embodiment ", " some embodiment ", " specific embodiment " etc. means to be contained at least one embodiment of the present invention or example in conjunction with specific features, structure, material or the feature of this embodiment or example description.In this manual, the schematic statement of above-mentioned term is not necessarily referred to identical embodiment or example.And specific features, structure, material or the feature of description can be with suitable mode combination in any one or more embodiment or example.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (12)
1. a method that prevents refrigerant bias current in multi-connected air conditioner, is characterized in that, comprises the following steps:
Step S102, obtains the degree of superheat of each indoor heat converter of described multi-connected air conditioner;
Step S104, the degree of superheat of indoor heat converter described in each and the target degree of superheat are compared, when the degree of superheat of the described indoor heat converter obtaining and the described target degree of superheat are when unequal, the aperture that regulates the expansion valve of indoor set, makes the degree of superheat of the described indoor heat converter obtaining be tending towards equating with the described target degree of superheat;
Step S106, if when the regulation of described expansion valve to maximum duration reaches default duration, the degree of superheat of the described indoor heat converter obtaining and the described target degree of superheat are still unequal, revise the described target degree of superheat, return to described step S102, and using the revised target degree of superheat the described target degree of superheat in described step S104.
2. the method that prevents refrigerant bias current in multi-connected air conditioner according to claim 1, is characterized in that, after described step S106, also comprises:
Step S108, if the described target degree of superheat after the correction of preset times, the degree of superheat of the described indoor heat converter obtaining with still unequal through the revised target degree of superheat of preset times, report to the police.
3. the method that prevents refrigerant bias current in multi-connected air conditioner according to claim 2, is characterized in that,
Described preset times is 3.
4. the method that prevents refrigerant bias current in multi-connected air conditioner according to claim 3, is characterized in that,
The described target degree of superheat that the n time revised target degree of superheat equals unmodified adds n, and n is the natural number that is not more than described preset times.
5. according to the method that prevents refrigerant bias current in multi-connected air conditioner described in any one in claim 1 to 4, it is characterized in that, in described step S104,
If the degree of superheat of the described indoor heat converter obtaining is greater than the described target degree of superheat or the degree of superheat of the described indoor heat converter that obtains is greater than the revised target degree of superheat, increase the aperture of described expansion valve;
If the degree of superheat of the described indoor heat converter obtaining is less than the described target degree of superheat or the degree of superheat of the described indoor heat converter that obtains is less than the revised target degree of superheat, reduce the aperture of described expansion valve.
6. the method that prevents refrigerant bias current in multi-connected air conditioner according to claim 5, is characterized in that,
In described step S102, obtain once the degree of superheat of described indoor heat converter every Preset Time.
7. the method that prevents refrigerant bias current in multi-connected air conditioner according to claim 6, is characterized in that,
The degree of superheat of described indoor heat converter is the temperature of exit refrigerant of described indoor heat converter and the difference of the temperature of porch refrigerant.
8. the method that prevents refrigerant bias current in multi-connected air conditioner according to claim 5, is characterized in that,
The described target degree of superheat before correction is 0～5 DEG C.
9. a system that prevents refrigerant bias current in multi-connected air conditioner, is characterized in that, comprising:
Degree of superheat acquiring unit, for obtaining the degree of superheat of each indoor heat converter of described multi-connected air conditioner;
Regulon, the degree of superheat of indoor heat converter described in each and the target degree of superheat are compared, when the degree of superheat of the described indoor heat converter obtaining and the described target degree of superheat are when unequal, the aperture that regulates the expansion valve of indoor set, makes the degree of superheat of the described indoor heat converter obtaining be tending towards equating with the described target degree of superheat; With
Amending unit, if when the regulation of described expansion valve to maximum duration reaches default duration, the degree of superheat of the described indoor heat converter obtaining and the described target degree of superheat are still unequal, revise the described target degree of superheat, and using the revised target degree of superheat the described target degree of superheat in described regulon.
10. the system that prevents refrigerant bias current in multi-connected air conditioner according to claim 9, is characterized in that, also comprises:
Alarm unit, if described amending unit carries out after the correction of preset times the described target degree of superheat, the described degree of superheat of obtaining is with still unequal through the revised target degree of superheat of preset times, described alarm unit is reported to the police.
11. according to the system that prevents refrigerant bias current in multi-connected air conditioner described in claim 9 or 10, it is characterized in that, described degree of superheat acquiring unit comprises:
Detecting unit, described detecting unit comprises the first temperature-sensitive bag and the second temperature-sensitive bag, described the first temperature-sensitive bag is connected with the entrance of described indoor heat converter, and can detect the temperature of the porch refrigerant of described indoor heat converter, described the second temperature-sensitive bag is connected with the outlet of described indoor heat converter, and can detect the temperature of the exit refrigerant of described indoor heat converter; With
Computing unit, calculates the temperature of exit refrigerant of described indoor heat converter and the difference of the temperature of porch refrigerant, obtains the degree of superheat of described indoor heat converter.
12. 1 kinds of multi-connected air conditioners, is characterized in that, comprising:
The system that prevents refrigerant bias current in multi-connected air conditioner as described in any one in claim 9 to 11.
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