CN102954555A - Method for controlling opening of expansion valve - Google Patents
Method for controlling opening of expansion valve Download PDFInfo
- Publication number
- CN102954555A CN102954555A CN2011102417260A CN201110241726A CN102954555A CN 102954555 A CN102954555 A CN 102954555A CN 2011102417260 A CN2011102417260 A CN 2011102417260A CN 201110241726 A CN201110241726 A CN 201110241726A CN 102954555 A CN102954555 A CN 102954555A
- Authority
- CN
- China
- Prior art keywords
- superheat
- degree
- expansion valve
- current
- tsh
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Abstract
The invention discloses a method for controlling opening of an expansion valve. The method includes the steps of firstly, setting targeted superheat degree, superheat degree difference reduced value, quick action quantity, stable action quantity, quick waiting time and stable waiting time, wherein the quick waiting time is less than the stable waiting time; secondly calculating current superheat degree difference; and thirdly, judging whether absolute value of the current superheat degree difference is larger than the superheat degree difference reduced value or not, according to the judged result, controlling the expansion valve to act according to the quick action quantity or stable action quantity, and returning to the step 2 after corresponding quick waiting time or stable waiting time. The method is used for arranging corresponding regulation areas according to the superheat degree difference, and time interval of action of the expansion valve is short when the superheat degree difference is far from the targeted superheat degree, so that the superheat degree difference is conveniently close to the targeted superheat degree quickly; and time interval of action of the expansion valve is long when the superheat degree difference is close to the targeted superheat degree, the interval is regulated when the current superheat degree changes to be adaptable to the current opening, and accordingly lagged influence and vibration of a system are eliminated and opening of the expansion valve is approximately optimal.
Description
Technical field
The present invention relates to the control valve technical field, particularly a kind of method of controlling expansion valve opening.
Background technology
In existing constant speed domestic air-conditioning system, generally adopt capillary or heating power expansion valve to carry out throttling.Yet during capillary-compensated, the flow of refrigerant can't be regulated with the change of operating mode, causes the cooling/heating ability can not optimization, and the room temperature attainability is poor, and easily causes a series of system problems such as hypertonia under the hot conditions; Heating power expansion valve can be adjusted cold medium flux automatically according to the degree of superheat, but owing to existing temperature to arrive the transmittance process of pressure, has control lag, problem that fluctuation is large, thereby causes systematic function to descend, and can't move under the state of optimum.
In order to solve the problem of said structure expansion valve, there is the electric expansion valve of regulating aperture according to the degree of superheat in the prior art, aperture by real-time control electric expansion valve is so that refrigerant keeps optimum flow, thereby makes system be in the optimization state, improves systematic function.
The regulation of above-mentioned electric expansion valve is mainly realized by following manner: at first, the target setting degree of superheat, the target degree of superheat can be determined according to the delivery temperature of exhaust outlet of compressor; Secondly, the current degree of superheat of Real-time Obtaining, the current degree of superheat can calculate according to the temperature difference of evaporator and outlet; At last, calculate the difference of the target degree of superheat and the current degree of superheat, owing to having corresponding relation between the aperture of the degree of superheat and electric expansion valve, the aperture of regulating electric expansion valve can make the current degree of superheat gradually near the target degree of superheat, the main optimum aperture codomain of calculating electric expansion valve by two score value domain search methods is until obtain optimum aperture.
Above-mentioned electric expansion valve can change according to the degree of superheat regulates aperture in real time, solved to a certain extent the problem of capillary and pressure expansion valve, yet still there is following technical problem in it in adjustment process:
First, the degree of superheat is by the temperature of the outlet that detects evaporimeter and entrance and calculated difference or detects compressor suction and the temperature of evaporimeter medium temperature and calculated difference obtain, and with the adjusting of expansion valve opening, there is stable process in the adjusting of system temperature, each temperature value that then detects often is not the equilibrium temperature corresponding with the current aperture of expansion valve, the formation of equilibrium temperature lags behind expansion valve opening and regulates, therefore, even the current aperture of expansion valve has satisfied degree of superheat demand, because hysteresis quality impact, control system still can continue to regulate aperture according to the temperature that detects, thereby cause expansion valve in the process of regulating, can have larger vibration, can't be stabilized on the required desired value always.
When the second, calculating the optimum aperture of method control expansion valve of optimum aperture codomain by two score value domain search methods, the optimum aperture that two score value domain search methods are determined must be between the bound of optimum aperture codomain, therefore the minimum that expansion valve opening is regulated will be subject to the restriction of optimum aperture codomain, can't accomplish the aperture amount control of minimum precision.In addition, continuous positive and negative adjustment when two score value domain search methods may cause expansion valve opening to be adjusted, the vibration that further strengthens system.
Summary of the invention
Core of the present invention is for providing a kind of method of controlling expansion valve opening, the method is according to the big or small setting regions of the degree of superheat and target degree of superheat difference, zones of different arranges the different stand-by period, thereby make the expansion valve can be on the basis of improving regulation and control speed, the hysteresis quality impact of elimination system, improve accuracy, and the vibration when reducing system regulation.
To achieve the object of the present invention, the invention provides a kind of method of controlling expansion valve opening, comprise the steps:
1) the target setting degree of superheat, degree of superheat difference reduced value Δ T1, quick acting amount and operating stably amount, quick stand-by period and stable stand-by period, and the quick stand-by period is less than stablizing the stand-by period;
2) obtain the current degree of superheat and calculate it and the current degree of superheat difference DELTA Tsh of the described target degree of superheat;
Whether the absolute value of 3) judging this current degree of superheat difference DELTA Tsh is then to enter step 31 greater than degree of superheat difference reduced value Δ T1); No, then enter step 32);
31) the control expansion valve moves according to described quick acting amount, and returns step 2 after the described quick stand-by period of correspondence);
32) the control expansion valve moves according to described operating stably amount, and returns step 2 after the described stable stand-by period of correspondence).
Preferably,
Step 1) in, set degree of superheat difference reduced value Δ T1, the Δ T2, the Δ T3... Δ Tn that sequentially increase, n 〉=2 wherein, and set respectively with Δ T1～Δ T2 zone, Δ T2～Δ T3 zone ... quick stand-by period T1 corresponding to Δ Tn～Δ+∞ zone, T2, T3 ... Tn, wherein, T1＞T2＞T3...＞Tn;
Step 31) in, determine the zone corresponding with current degree of superheat difference DELTA Tsh, the control expansion valve moves according to described quick acting amount, and returns step 2 in the corresponding region after the corresponding quick stand-by period).
Preferably,
Step 1) in, set respectively with Δ T1～Δ T2 zone, Δ T2～Δ T3 zone ... actuating quantity COEFFICIENT K 1 corresponding to Δ Tn～Δ+∞ zone, K2, K3 ... Kn, wherein, K1＜K2＜K3...＜Kn; And the quick acting amount equals the product of the actuating quantity coefficient of current degree of superheat difference DELTA Tsh and corresponding region;
Step 31) in, the product that calculates the actuating quantity coefficient of current degree of superheat difference DELTA Tsh and corresponding region obtains corresponding quick acting amount, the control expansion valve moves according to the quick acting amount, and returns step 2 in the corresponding region after this corresponding quick stand-by period).
Preferably, the described operating stably amount operation precision that is expansion valve.
Preferably,
Step 1) in, also sets degree of superheat difference reduced value Δ T0, Δ T0＜Δ T1;
When the absolute value of the current degree of superheat difference DELTA Tsh of judgement is less than degree of superheat difference reduced value Δ T1 step 3), judge that also the absolute value of current degree of superheat difference DELTA Tsh whether less than Δ T0, is then to enter step 33); No, then enter step 32);
33) the current degree of superheat difference DELTA Tsh of record and current aperture, and after stablizing the stand-by period, move according to the operating stably amount, record again current degree of superheat difference DELTA Tsh and current aperture, contrast the corresponding relation that obtains between degree of superheat variable quantity and the expansion valve opening variable quantity by the aperture of stablizing the stand-by period front and back;
34) calculate the aperture compensating movement amount corresponding with current degree of superheat difference DELTA Tsh according to this corresponding relation;
35) the control expansion valve is according to this aperture compensating movement amount action;
36) the current degree of superheat of obtaining expansion valve is also calculated the current degree of superheat difference DELTA Tsh of acquisition, enters step 37);
Whether the absolute value of 37) judging current degree of superheat difference DELTA Tsh is then to return step 34 less than Δ T0); No, then return step 3).
Preferably, step 33) specifically comprise the steps:
331) the current degree of superheat difference DELTA Tsh of record is that the current aperture of the first degree of superheat difference DELTA Tsh1, expansion valve is the first current aperture P1;
332) the control expansion valve moves according to the operating stably amount, and enters step 333 after stablizing the stand-by period);
333) obtain current aperture P and the current degree of superheat of expansion valve, calculate and obtain current degree of superheat difference DELTA Tsh, and calculate | (Δ Tsh-Δ Tsh1) |;
334) calculate degree of superheat changing value B and the aperture compensating movement amount S that reacts corresponding relation between degree of superheat variable quantity and the expansion valve opening variable quantity:
B＝|(ΔTsh-ΔTsh1)|/(P-P1)；
Step 34) in, calculates aperture compensating movement amount S:S=(Δ Tsh-0)/B.
Preferably, go back design temperature step 1) and detect minimum of a value; Step 332) also judge in | (Δ Tsh-Δ Tsh1) | greater than the minimum of a value of temperature detector, be then to enter step 334 whether), no, then return step 332).
The method that this invention provides arranges corresponding quick regulation and control zone and stable regulation and control zone according to the difference size of the current degree of superheat and the target degree of superheat, two regulation and control region divisions corresponding fast stand-by period and stable stand-by period.The zone that is about to the wide degree of superheat is set as quick regulation and control zone, and the expansion valve action is shorter blanking time, and aperture changes very fast, so that fast near the target degree of superheat; The current degree of superheat is during near the target degree of superheat, be set as stable regulation and control zone, action is longer blanking time, treat that the current degree of superheat is changed to when adapting with the current aperture of expansion valve, proceed again degree of superheat sampling, calculate current degree of superheat difference and again regulate, thereby can eliminate hysteresis quality and the vibration that quick regulation and control zone exists, make the aperture of expansion valve gradually near optimum aperture, to obtain the target degree of superheat.Then this control method can be on the basis of fast regulation and control, the impact of oscillation-damped and system's hysteresis quality.
In further technical scheme, to regulate and control fast the zone and be divided into more multizone, the quick stand-by period difference that zones of different is corresponding, and because the setting of actuating quantity coefficient, faster with the regulation and control speed in target degree of superheat zone far away, form gradient control, make quick regulation and control zone both have higher regulation and control speed, adjustment process is comparatively gentle again, progressively enters stable regulation and control zone, further reduces the vibration of system and the impact of hysteresis quality.
In further technical scheme, also done further segmentation for the stability control area territory.When current degree of superheat difference DELTA Tsh was between Δ T0～Δ T1, by stablizing regulation and control model adjustment, system was in stable state substantially, can be used as pre-stable regulation and control field; The current degree of superheat when namely current degree of superheat difference DELTA Tsh is between 0～Δ T0, can be carried out high-precision regulation and control during further near the target degree of superheat, as aperture compensation regulation and control field.Behind pre-stable regulation and control field, when entering aperture compensation regulation and control field, calculate degree of superheat changing value, then calculate the aperture compensation rate of still needing and moving for reaching target degree of superheat expansion valve, after the expansion valve action, wait be can stabilize equally, after the overcompensation stand-by period, calculating and the action of next round carried out.Therefore, this step can determine to reach the required aperture actuating quantity of the target degree of superheat on the basis of system stability, thereby improves the precision that expansion valve opening is regulated.
Description of drawings
Fig. 1 is the control flow chart of the first specific embodiment of control expansion valve opening method provided by the present invention;
Fig. 2 is the control flow chart of the second specific embodiment of the method for control expansion valve opening provided by the present invention;
Fig. 3 regulates and control actuating quantity coefficient of each zone correspondence in the zone and the functional relation schematic diagram of degree of superheat absolute difference fast;
Fig. 4 regulates and control quick stand-by period of each zone correspondence in the zone and the functional relation schematic diagram of degree of superheat absolute difference fast;
Fig. 5 is the control flow chart of the third specific embodiment of control expansion valve opening method provided by the present invention;
Fig. 6 be in Fig. 5 control method each regulation and control zone simplified schematic diagram.
The specific embodiment
Core of the present invention is for providing a kind of method of controlling expansion valve opening, the method is according to the big or small setting regions of the degree of superheat and target degree of superheat difference, zones of different arranges the different stand-by period, thereby make the expansion valve can be on the basis of improving regulation and control speed, the hysteresis quality impact of elimination system, improve accuracy, and the vibration when reducing system regulation.
In order to make those skilled in the art understand better technical scheme of the present invention, the present invention is described in further detail below in conjunction with the drawings and specific embodiments.
Please refer to Fig. 1, Fig. 1 is the control flow chart of the first specific embodiment of control expansion valve opening method provided by the present invention.
The method of the control control expansion valve opening that this specific embodiment provides comprises the steps:
S11) the target setting degree of superheat, degree of superheat difference reduced value Δ T1, quick acting amount and operating stably amount, quick stand-by period and stable stand-by period, and the quick stand-by period is less than stablizing the stand-by period;
Expansion valve can carry out first resetting of expansion valve when starting beginning, after resetting, expansion valve opening will be set to default aperture (can arrange arbitrarily) in the aperture scope of expansion valve, in stable condition for making it, can keep this aperture certain hour.
The target degree of superheat is the super heat value when reaching optimization for refrigeration or heating ability to work, can determine according to the service behaviour of refrigeration or heating, such as, determine according to the refrigerant temperature of exhaust outlet of compressor.Expansion valve opening corresponding to the target degree of superheat is best aperture, obtains the target degree of superheat by expansion valve opening being adjusted to best aperture place.Degree of superheat difference reduced value is in the aftermentioned step, and as the normative reference of current degree of superheat difference DELTA Tsh, current degree of superheat difference DELTA Tsh is the difference of the current degree of superheat and the target degree of superheat.Degree of superheat difference reduced value Δ T1 is the numerical value greater than zero, the purpose of setting degree of superheat difference reduced value Δ T1 is to distinguish greater than the zone of degree of superheat difference reduced value Δ T1 with less than the zone of degree of superheat difference reduced value Δ T1, the former is the zone of the wide degree of superheat, the latter is the zone near the target degree of superheat, and the concrete numerical value of degree of superheat difference reduced value Δ T1 can determine according to concrete system and actual condition.
S12) obtain the current degree of superheat and calculate it and the current degree of superheat difference DELTA Tsh of the target degree of superheat;
The current degree of superheat (the current degree of superheat during original state is corresponding with default aperture) can obtain by the difference of calculating evaporator outlet temperature and evaporator temperature, in evaporator outlet with import department arranges the temperature-sensitive bag or temperature sensor can obtain the current degree of superheat.
Whether the absolute value of S13) judging current degree of superheat difference DELTA Tsh is then to enter step S131 greater than degree of superheat difference reduced value Δ T1); No, then enter step S132);
Absolute value and degree of superheat difference reduced value Δ T1 with current degree of superheat difference DELTA Tsh in this step compare, as previously mentioned, the zone that is set as the differentiation wide degree of superheat of degree of superheat difference reduced value Δ T1 and the zone near the target degree of superheat, when the current degree of superheat is greater than or less than target degree of superheat certain value, it is consistent needing the aperture size of regulation and control, difference only is the direction of expansion valve action, therefore, herein with the absolute value of current degree of superheat difference DELTA Tsh and degree of superheat difference reduced value Δ T1 relatively.
S131) the control expansion valve moves according to the quick acting amount, and returns step S12 after the quick stand-by period of correspondence);
Expansion valve can carry out the adjustment of expansion valve opening according to current degree of superheat difference DELTA Tsh, so that the aperture of expansion valve is near best aperture., before the expansion valve action, also follow the judgement of current degree of superheat difference DELTA Tsh and difference value of zero herein, current degree of superheat difference DELTA Tsh is greater than zero the time, and control expansion valve positive action is namely moved towards the direction that increases expansion valve opening; Less than zero the time, control expansion valve counteragent is namely towards the direction action that reduces aperture.The step that relates to action in the following content all exists this to locate described deterministic process, so that expansion valve opening changes towards optimum aperture, followingly relates to the judgement of direction of action in the action step with consistent herein, no longer repeats to discuss.
S132) the control expansion valve moves according to the operating stably amount, and returns step S12 after the stable stand-by period of correspondence).
By this specific embodiment as can be known, current degree of superheat difference DELTA Tsh is during greater than degree of superheat difference reduced value Δ T1, and the current degree of superheat and target degree of superheat difference are larger, and at this moment, expansion valve is according to the quick acting amount and the stand-by period moves fast; Current degree of superheat difference DELTA Tsh is during less than degree of superheat difference reduced value Δ T1, and the current degree of superheat is near the target degree of superheat, and expansion valve is according to operating stably amount and the action of stable stand-by period, and fast the stand-by period less than stablizing the stand-by period.
When being the wide degree of superheat, be set as quick regulation and control zone, the expansion valve action is shorter blanking time, and aperture changes very fast, so that fast near the target degree of superheat; The current degree of superheat is during near the target degree of superheat, be set as stable regulation and control zone, action is longer blanking time, treat that the current degree of superheat is changed to when adapting with the current aperture of expansion valve, proceed again degree of superheat sampling, calculate current degree of superheat difference DELTA Tsh and again regulate, thereby can eliminate hysteresis quality (the regulation and control speed that quick regulation and control zone exists, the current degree of superheat not yet reaches the super heat value that current aperture ought to be corresponding) and vibration, make the aperture of expansion valve gradually near optimum aperture, to obtain the target degree of superheat.Hence one can see that, this embodiment is according to the difference size of the current degree of superheat and the target degree of superheat, corresponding quick regulation and control zone and stable regulation and control zone are set, on the basis of fast regulation and control, the impact of oscillation-damped and system's hysteresis quality, certainly for further oscillation-damped impact, the quick acting amount is greater than the operating stably amount.
Please refer to Fig. 2 to Fig. 4, Fig. 2 is the control flow chart of the second specific embodiment of the method for control expansion valve opening provided by the present invention; Fig. 3 regulates and control actuating quantity coefficient of each zone correspondence in the zone and the functional relation schematic diagram of degree of superheat absolute difference fast; Fig. 4 regulates and control quick stand-by period of each zone correspondence in the zone and the functional relation schematic diagram of degree of superheat absolute difference fast.
The method of this specific embodiment control expansion valve opening has following step:
S21) the target setting degree of superheat, the degree of superheat difference reduced value Δ T1 that sequentially increases, Δ T2, Δ T3 ... Δ Tn; Set the actuating quantity coefficient corresponding with degree of superheat difference reduced value zoning, quick acting amount, quick stand-by period; Also set and stablize stand-by period and operating stably amount;
Namely arrange the degree of superheat difference reduced value Δ T1 that sequentially increases, Δ T2, Δ T3 ... Δ Tn, wherein, n 〉=2, each degree of superheat difference reduced value will be regulated and control fast the zone and be divided into altogether n zone of Δ T1～Δ T2, Δ T2～Δ T3, Δ T3～Δ T4... Δ Tn～Δ+∞, the stable stand-by period T that sets comprise respectively with each zone sequentially corresponding quick stand-by period T1, T2, T3 ... Tn, wherein T1＞T2＞T3＞...＞Tn; The actuating quantity COEFFICIENT K comprise respectively with each zone sequentially corresponding actuating quantity COEFFICIENT K 1, K2, K3 ... Kn, wherein, K1＜K2＜K3＜...＜Kn, can understand in conjunction with Fig. 3 and Fig. 4.Wherein quick acting amount corresponding to each zone equals the product of the actuating quantity coefficient of current degree of superheat difference DELTA Tsh and corresponding region.In addition, the quick stand-by period is less than stablizing the stand-by period.
S22) obtain the current degree of superheat and calculate it and the current degree of superheat difference DELTA Tsh of the target degree of superheat;
Whether the absolute value of S23) judging this current degree of superheat difference DELTA Tsh is then to enter step S231 greater than Δ T1); No, then enter step S232);
S231) determine the zone corresponding with current degree of superheat difference DELTA Tsh, calculate the actuating quantity coefficient of corresponding region and the product of current degree of superheat difference DELTA Tsh, draw the quick acting amount, enter step S233);
S233) the control expansion valve moves according to the quick acting amount, and returns step 22 in the corresponding region after the corresponding quick stand-by period);
After judging that namely current degree of superheat difference DELTA Tsh is in quick regulation and control zone, still need and further determine to regulate and control fast the zone corresponding with current degree of superheat difference DELTA Tsh in the zone, namely this step comprises deterministic process.Further illustrate, can be with reference to Fig. 6 described later, n=3, can be divided into fast between high velocity (degree of superheat difference＞5 ℃ between control region, Δ T3=5 ℃), the interval (3 ℃＜degree of superheat difference≤5 ℃ of middling speed, Δ T2=3 ℃) and low regime between (1 ℃＜degree of superheat difference≤3 ℃, Δ T1=1 ℃), the degree of superheat of Three regions and the target degree of superheat are close gradually; Between high velocity, actuating quantity coefficient corresponding between middling speed interval and low regime is respectively K3, K2, K1 (can get K3=3, K2=2, K1=1), the corresponding quick stand-by period is T3, T2, T1 (can get T3=30s, T2=45s, T1=60s).Then when current degree of superheat difference DELTA Tsh is between high velocity, suppose Δ Tsh=6, expansion valve moves with quick acting amount=K3 * Δ Tsh=18, and returns step S22 behind T3=30s); When being in the middling speed interval, suppose Δ Tsh=4, expansion valve moves with quick acting amount=K2 * Δ Tsh=8, and returns step S22 behind T2=45s); When being between low regime, suppose Δ Tsh=2, expansion valve moves with quick acting amount=K1 * Δ Tsh=2, and returns step S22 behind T1=60s).Then will regulate and control fast the zone and be divided into more multizone, the quick stand-by period difference that zones of different is corresponding, and because the setting of actuating quantity coefficient, faster with the regulation and control speed in target degree of superheat zone far away, the control of formation gradient makes quick regulation and control zone both have higher regulation and control speed, and adjustment process is comparatively gentle again, progressively enter step S232) stable regulation and control zone, further reduce the vibration of system and the impact of hysteresis quality.
S232) the control expansion valve moves according to described operating stably amount, and returns step S22 after the described stable stand-by period of correspondence).
This step and step S12) identical, play the purpose of stablizing regulation and control.
Step S21) in, preferably the operating stably amount is set as the operation precision of expansion valve.Be that expansion valve opening is in stable regulation and control zone, during near optimum aperture, reduce the each actuating quantity of expansion valve, actuating quantity only is the operation precision of expansion valve (being generally 1pulse or 2pulse), and the stable stand-by period that arranges long (such as, can be set to 3 minutes, after common 3 minutes, the system overheat degree can be changed to the state that adapts with expansion valve opening, in order further to improve regulation and control speed, can determine to stablize the stand-by period according to experiment, if experiment determines that the degree of superheat namely reaches comparatively stable state in 1 minute, then also can be made as 1 minute with stablizing the stand-by period), the time of expansion valve opening action is shorter, then behind the regulation, can enter stable wait state, through after stablizing the stand-by period, the side carries out the next round sampling and calculates, and the regulation and control of then stablizing the regulation and control zone are more stable.
Please refer to Fig. 5 and Fig. 6, Fig. 5 is the control flow chart of the third specific embodiment of control expansion valve opening method provided by the present invention; Fig. 6 is the simplified schematic diagram in each regulation and control zone in Fig. 5 control method.
The method of this specific embodiment control expansion valve opening has following step:
S31) the target setting degree of superheat, the degree of superheat difference reduced value Δ T0 that sequentially increases, Δ T1, Δ T2, Δ T3 ... Δ Tn; Set the actuating quantity coefficient corresponding with degree of superheat difference reduced value zoning, quick acting amount, quick stand-by period; Also set and stablize stand-by period, operating stably amount;
With step S21) similar, arrange the degree of superheat difference reduced value Δ T0 that sequentially increases, Δ T1, Δ T2, Δ T3 ... Δ Tn, wherein, n 〉=2, and setting T1, the T2 corresponding with the zoning, T3 ... Tn and K1, K2, K3 ... Kn.Compared to step S21), this step also is divided into 0～Δ T0 and Δ T0～two zones of Δ T1 with the zone of 0～Δ T1.The quick acting amount equals the product of the actuating quantity coefficient of current degree of superheat difference DELTA Tsh and corresponding region equally, and the operating stably amount that herein arranges is the operation precision of expansion valve.
S32) obtain the current degree of superheat and calculate it and the current degree of superheat difference DELTA Tsh of the target degree of superheat;
S33) judge that this current degree of superheat difference DELTA Tsh whether greater than Δ T1, is then to enter step S332); No, then enter step S331);
S332) determine zone corresponding to current degree of superheat difference DELTA Tsh, calculate the actuating quantity coefficient of corresponding region and the product of corresponding degree of superheat difference and draw the quick acting amount, enter step S3321);
S3321) the control expansion valve moves according to the quick acting amount, and returns step 32 in the corresponding region after the corresponding quick stand-by period);
S331) judge that this current degree of superheat difference DELTA Tsh whether greater than Δ T0, is then to enter step S3312), no, then enter step S3311);
S3312) the control expansion valve moves according to the operating stably amount, and returns step S32 after the stable stand-by period of correspondence);
S3311) the current degree of superheat difference DELTA Tsh of record is that the current aperture P of the first current super heat value Δ Tsh1, expansion valve is the first current aperture P1;
S3312) the control expansion valve moves according to the operating stably amount, and enters step S3313 after stablizing the stand-by period);
When operating stably measured operation precision (being generally 1pulse or 2pulse) for expansion valve, the each action of expansion valve can more accurately be reacted the corresponding relation between expansion valve opening variable quantity and the degree of superheat variable quantity with the operation precision action.Hence one can see that, and this place also can move not according to operation precision, also can realize purpose of the present invention according to less operating stably amount action.
S3313) obtain current aperture P and the current degree of superheat of expansion valve, calculate and obtain current degree of superheat difference DELTA Tsh, and calculate | (Δ Tsh-Δ Tsh1) |;
S3314) calculate degree of superheat changing value B:B=| (Δ Tsh-Δ Tsh1) |/(P-P1);
S3315) calculate aperture compensating movement amount S:S=(Δ Tsh-0)/B;
S3316) according to the action of aperture compensating movement amount S control expansion valve, and after stablizing the stand-by period, enter step S3317);
S3317) obtain current aperture P and the current degree of superheat of expansion valve, calculate and obtain current degree of superheat difference DELTA Tsh;
S3318) judge that this current degree of superheat difference DELTA Tsh whether greater than Δ T0, is then to return step S33), no, then return step S3311).
With to stablize the stand-by period in the second specific embodiment similar, the stable stand-by period can obtain according to experiment.
In this embodiment, also done further segmentation for the stability control area territory, among Fig. 6 Δ T0=0.5 ℃.When current degree of superheat difference DELTA Tsh was between Δ T0～Δ T1, by stablizing regulation and control model adjustment, system was in stable state substantially, can be used as pre-stable regulation and control field; The current degree of superheat when namely current degree of superheat difference DELTA Tsh is between 0～Δ T0, can be carried out high-precision regulation and control during further near the target degree of superheat, as aperture compensation regulation and control field.When degree of superheat changing value B is the every increase of aperture or minimizing unit act precision, the variable quantity of the degree of superheat, be that degree of superheat changing value B can react the corresponding relation between aperture variable quantity and the degree of superheat variable quantity, after through pre-stable regulation and control field, can comparatively accurately measure this value, when entering aperture compensation regulation and control field, calculate degree of superheat changing value B, then calculate the aperture compensation rate of still needing and moving for reaching target degree of superheat expansion valve, after the expansion valve action, wait be can stabilize equally, through after stablizing the stand-by period, calculating and the action of next round carried out.Therefore, this step can determine to reach the required aperture actuating quantity of the target degree of superheat on the basis of system stability, thereby improves the precision that expansion valve opening is regulated.This specific embodiment is directly reacted corresponding relation between aperture variable quantity and the degree of superheat variable quantity by calculating degree of superheat changing value B, the aperture variable quantity is the aperture difference before and after the action, in fact, this aperture difference is aperture corresponding to operating stably amount, also can obtain according to the corresponding relation between operation precision and the aperture.Certainly, as long as contrast the corresponding relation that obtains between degree of superheat variable quantity and the expansion valve opening variable quantity by the aperture before and after the action, can realize improving the purpose of control accuracy to obtain aperture compensating movement amount.
Step S3312) and step S3313) between can also have a determining step, namely judge | (Δ Tsh-Δ Tsh1) | whether greater than the temperature detector minimum of a value (correspondingly, at step S31) in set this temperature detector minimum of a value), be, then return step S3314), no, then return step S3312).When calculating degree of superheat changing value B, need take a sample to front and back | (Δ Tsh-Δ Tsh1) | value is carried out the A/D conversion, usually have specific conversion accuracy, i.e. temperature detector minimum of a value, when | (Δ Tsh-Δ Tsh1) | during less than this temperature detector minimum of a value, system can't obtain this value, then can't carry out the calculating of degree of superheat changing value B, return step S3312), continue action, increase | (Δ Tsh-Δ Tsh1) | numerical value, be convenient to unfolding calculation.
Above a kind of method of controlling expansion valve opening provided by the present invention is described in detail.Used specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of claim of the present invention.
Claims (7)
1. a method of controlling expansion valve opening is characterized in that, comprises the steps:
1) the target setting degree of superheat, degree of superheat difference reduced value Δ T1, quick acting amount and operating stably amount, quick stand-by period and stable stand-by period, and the quick stand-by period is less than stablizing the stand-by period;
2) obtain the current degree of superheat and calculate it and the current degree of superheat difference DELTA Tsh of the described target degree of superheat;
Whether the absolute value of 3) judging this current degree of superheat difference DELTA Tsh is then to enter step 31 greater than degree of superheat difference reduced value Δ T1); No, then enter step 32);
31) the control expansion valve moves according to described quick acting amount, and returns step 2 after the described quick stand-by period of correspondence);
32) the control expansion valve moves according to described operating stably amount, and returns step 2 after the described stable stand-by period of correspondence).
2. the method for control expansion valve opening according to claim 1 is characterized in that,
Step 1) in, set degree of superheat difference reduced value Δ T1, the Δ T2, the Δ T3... Δ Tn that sequentially increase, n 〉=2 wherein, and set respectively with Δ T1～Δ T2 zone, Δ T2～Δ T3 zone ... quick stand-by period T1 corresponding to Δ Tn～Δ+∞ zone, T2, T3 ... Tn, wherein, T1＞T2＞T3...＞Tn;
Step 31) in, determine the zone corresponding with current degree of superheat difference DELTA Tsh, the control expansion valve moves according to described quick acting amount, and returns step 2 in the corresponding region after the corresponding quick stand-by period).
3. the method for control expansion valve opening according to claim 2 is characterized in that,
Step 1) in, set respectively with Δ T1～Δ T2 zone, Δ T2～Δ T3 zone ... actuating quantity COEFFICIENT K 1 corresponding to Δ Tn～Δ+∞ zone, K2, K3 ... Kn, wherein, K1＜K2＜K3...＜Kn; And the quick acting amount equals the product of the actuating quantity coefficient of current degree of superheat difference DELTA Tsh and corresponding region;
Step 31) in, the product that calculates the actuating quantity coefficient of current degree of superheat difference DELTA Tsh and corresponding region obtains corresponding quick acting amount, the control expansion valve moves according to this quick acting amount, and returns step 2 in the corresponding region after the corresponding quick stand-by period).
4. according to claim 1 to the method for 3 each described control expansion valve openings, it is characterized in that, described operating stably amount is the operation precision of expansion valve.
5. the method for control expansion valve opening according to claim 4 is characterized in that,
Step 1) in, also sets degree of superheat difference reduced value Δ T0, Δ T0＜Δ T1;
When the absolute value of the current degree of superheat difference DELTA Tsh of judgement is less than degree of superheat difference reduced value Δ T1 step 3), judge that also the absolute value of current degree of superheat difference DELTA Tsh whether less than Δ T0, is then to enter step 33); No, then enter step 32);
33) the current degree of superheat difference DELTA Tsh of record and current aperture, and after stablizing the stand-by period, move according to the operating stably amount, record again current degree of superheat difference DELTA Tsh and current aperture, contrast the corresponding relation that obtains between degree of superheat variable quantity and the expansion valve opening variable quantity by the aperture of stablizing the stand-by period front and back;
34) calculate the aperture compensating movement amount corresponding with current degree of superheat difference DELTA Tsh according to this corresponding relation;
35) the control expansion valve is according to this aperture compensating movement amount action;
36) the current degree of superheat of obtaining expansion valve is also calculated the current degree of superheat difference DELTA Tsh of acquisition, enters step 37);
Whether the absolute value of 37) judging current degree of superheat difference DELTA Tsh is then to return step 34 less than Δ T0); No, then return step 3).
6. the method for control expansion valve opening according to claim 5 is characterized in that,
Step 33) specifically comprises the steps:
331) the current degree of superheat difference DELTA Tsh of record is that the current aperture of the first degree of superheat difference DELTA Tsh1, expansion valve is the first current aperture P1;
332) the control expansion valve moves according to the operating stably amount, and enters step 333 after stablizing the stand-by period);
333) obtain current aperture P and the current degree of superheat of expansion valve, calculate and obtain current degree of superheat difference DELTA Tsh, and calculate | (Δ Tsh-Δ Tsh1) |;
334) calculate the degree of superheat changing value B:B=| (Δ Tsh-Δ Tsh1) that reacts corresponding relation between degree of superheat variable quantity and the expansion valve opening variable quantity |/(P-P1);
Step 34) in, calculates aperture compensating movement amount S:S=(Δ Tsh-0)/B.
7. the method for control expansion valve opening according to claim 6 is characterized in that,
Step 1) goes back design temperature in and detect minimum of a value;
Step 332) also judge in | (Δ Tsh-Δ Tsh1) | greater than the minimum of a value of temperature detector, be then to enter step 334 whether), no, then return step 332).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110241726.0A CN102954555B (en) | 2011-08-22 | 2011-08-22 | Method for controlling opening of expansion valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110241726.0A CN102954555B (en) | 2011-08-22 | 2011-08-22 | Method for controlling opening of expansion valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102954555A true CN102954555A (en) | 2013-03-06 |
| CN102954555B CN102954555B (en) | 2014-09-10 |
Family
ID=47763701
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110241726.0A Active CN102954555B (en) | 2011-08-22 | 2011-08-22 | Method for controlling opening of expansion valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102954555B (en) |
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103206820A (en) * | 2013-04-27 | 2013-07-17 | 海尔集团公司 | Expansion valve opening controlling method for preventing oscillating of expansion valve |
| CN103743063A (en) * | 2014-01-17 | 2014-04-23 | 苏州海特温控技术有限公司 | Method of controlling electronic expansion valve during refrigeration of air conditioner |
| CN104110799A (en) * | 2013-05-30 | 2014-10-22 | 广东美的制冷设备有限公司 | Integrated control method and circuit for electronic expansion valve of air conditioner |
| CN104132432A (en) * | 2014-08-22 | 2014-11-05 | 四川长虹空调有限公司 | Electronic expansion valve approximation control method |
| CN106403140A (en) * | 2015-07-27 | 2017-02-15 | 青岛海尔空调电子有限公司 | Method for controlling electronic expansion valve of air cooling unit |
| CN106403425A (en) * | 2015-07-27 | 2017-02-15 | 青岛海尔空调电子有限公司 | Water chilling unit electronic expansion valve control method |
| CN106839546A (en) * | 2017-01-24 | 2017-06-13 | 深圳市冰润冷链科技有限公司 | Varying capacity adjusts thermodynamics inverse circulation systerm control method for overheat |
| CN108826773A (en) * | 2018-06-15 | 2018-11-16 | 广东芬尼克兹节能设备有限公司 | The control method and device of heat pump system electric expansion valve |
| CN109990510A (en) * | 2018-01-02 | 2019-07-09 | 杭州先途电子有限公司 | The control method of expansion valve in a kind of air-conditioning system |
| CN110017634A (en) * | 2018-01-08 | 2019-07-16 | 杭州先途电子有限公司 | A kind of control method of electric expansion valve |
| WO2019149167A1 (en) * | 2018-01-31 | 2019-08-08 | 青岛海尔空调电子有限公司 | Air conditioner heat dissipation structure control method and system |
| CN111271814A (en) * | 2019-07-22 | 2020-06-12 | 宁波奥克斯电气股份有限公司 | Refrigerant flow control method and device and air conditioner |
| CN111365905A (en) * | 2020-04-09 | 2020-07-03 | 上海泰达冷暖科技有限公司 | Heat exchanger, gas-liquid separator, refrigerating system, manufacturing method and application of heat exchanger |
| CN111609533A (en) * | 2020-05-22 | 2020-09-01 | 海信（山东）空调有限公司 | Control method and device of electronic expansion valve |
| CN112128450A (en) * | 2019-06-24 | 2020-12-25 | 中国科学院理化技术研究所 | Air valve adjusting method and air valve device |
| CN112524773A (en) * | 2020-12-09 | 2021-03-19 | 珠海格力电器股份有限公司 | Method and device for determining opening of electronic expansion valve |
| CN112710071A (en) * | 2020-12-28 | 2021-04-27 | 宁波奥克斯电气股份有限公司 | Method and device for controlling adjusting speed of electronic expansion valve and multi-split air conditioning system |
| WO2021169059A1 (en) * | 2020-02-25 | 2021-09-02 | 青岛海尔空调电子有限公司 | Method for controlling fixed-frequency air conditioner in refrigeration state |
| CN113819690A (en) * | 2021-08-10 | 2021-12-21 | 北京金茂绿建科技有限公司 | Heat pump system and electronic expansion valve control method |
| CN113959080A (en) * | 2021-09-30 | 2022-01-21 | 青岛海尔空调电子有限公司 | Control method for electronic expansion valve of air conditioning unit |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1380963A (en) * | 2000-06-07 | 2002-11-20 | 三星电子株式会社 | Control system of degree of superheat of air conditioner and ocntrol method thereof |
| EP1524475A1 (en) * | 2003-10-17 | 2005-04-20 | LG Electronics, Inc. | Apparatus and method for controlling the super-heating degree in a heat pump system |
| JP2006162235A (en) * | 2004-12-06 | 2006-06-22 | Samsung Electronics Co Ltd | Multi-air conditioner system, and valve opening control method for multi-air conditioner system |
| KR20080073475A (en) * | 2007-02-06 | 2008-08-11 | 삼성전자주식회사 | An air conditioner and control method of electronic expansion valve thereof |
| CN101276226A (en) * | 2007-03-26 | 2008-10-01 | 珠海格力电器股份有限公司 | Control method of electronic expansion valve |
-
2011
- 2011-08-22 CN CN201110241726.0A patent/CN102954555B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1380963A (en) * | 2000-06-07 | 2002-11-20 | 三星电子株式会社 | Control system of degree of superheat of air conditioner and ocntrol method thereof |
| EP1524475A1 (en) * | 2003-10-17 | 2005-04-20 | LG Electronics, Inc. | Apparatus and method for controlling the super-heating degree in a heat pump system |
| JP2006162235A (en) * | 2004-12-06 | 2006-06-22 | Samsung Electronics Co Ltd | Multi-air conditioner system, and valve opening control method for multi-air conditioner system |
| KR20080073475A (en) * | 2007-02-06 | 2008-08-11 | 삼성전자주식회사 | An air conditioner and control method of electronic expansion valve thereof |
| CN101276226A (en) * | 2007-03-26 | 2008-10-01 | 珠海格力电器股份有限公司 | Control method of electronic expansion valve |
Cited By (31)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103206820A (en) * | 2013-04-27 | 2013-07-17 | 海尔集团公司 | Expansion valve opening controlling method for preventing oscillating of expansion valve |
| CN104110799B (en) * | 2013-05-30 | 2016-12-07 | 广东美的制冷设备有限公司 | The integrated control method of air-conditioner electric expansion valve and circuit |
| CN104110799A (en) * | 2013-05-30 | 2014-10-22 | 广东美的制冷设备有限公司 | Integrated control method and circuit for electronic expansion valve of air conditioner |
| CN103743063A (en) * | 2014-01-17 | 2014-04-23 | 苏州海特温控技术有限公司 | Method of controlling electronic expansion valve during refrigeration of air conditioner |
| CN103743063B (en) * | 2014-01-17 | 2016-06-22 | 苏州海特温控技术有限公司 | The control method of electric expansion valve during a kind of air conditioner refrigerating |
| CN104132432A (en) * | 2014-08-22 | 2014-11-05 | 四川长虹空调有限公司 | Electronic expansion valve approximation control method |
| CN104132432B (en) * | 2014-08-22 | 2016-06-29 | 四川长虹空调有限公司 | The approximant control method of electric expansion valve |
| CN106403140A (en) * | 2015-07-27 | 2017-02-15 | 青岛海尔空调电子有限公司 | Method for controlling electronic expansion valve of air cooling unit |
| CN106403425A (en) * | 2015-07-27 | 2017-02-15 | 青岛海尔空调电子有限公司 | Water chilling unit electronic expansion valve control method |
| CN106403425B (en) * | 2015-07-27 | 2019-04-12 | 青岛海尔空调电子有限公司 | A kind of control method for electronic expansion valve of water chiller |
| CN106403140B (en) * | 2015-07-27 | 2019-05-24 | 青岛海尔空调电子有限公司 | A kind of control method for electronic expansion valve of air-cooled unit |
| CN106839546A (en) * | 2017-01-24 | 2017-06-13 | 深圳市冰润冷链科技有限公司 | Varying capacity adjusts thermodynamics inverse circulation systerm control method for overheat |
| CN106839546B (en) * | 2017-01-24 | 2019-09-03 | 深圳市冰润冷链科技有限公司 | Varying capacity adjusts thermodynamics inverse circulation systerm control method for overheat |
| CN109990510A (en) * | 2018-01-02 | 2019-07-09 | 杭州先途电子有限公司 | The control method of expansion valve in a kind of air-conditioning system |
| CN110017634A (en) * | 2018-01-08 | 2019-07-16 | 杭州先途电子有限公司 | A kind of control method of electric expansion valve |
| CN110017634B (en) * | 2018-01-08 | 2021-04-13 | 杭州先途电子有限公司 | Control method of electronic expansion valve |
| WO2019149167A1 (en) * | 2018-01-31 | 2019-08-08 | 青岛海尔空调电子有限公司 | Air conditioner heat dissipation structure control method and system |
| US11530855B2 (en) | 2018-01-31 | 2022-12-20 | Qingdao Haier Air-Conditioning Electronic Co., Ltd. | Air conditioner heat dissipation structure control method and system |
| CN108826773A (en) * | 2018-06-15 | 2018-11-16 | 广东芬尼克兹节能设备有限公司 | The control method and device of heat pump system electric expansion valve |
| CN112128450A (en) * | 2019-06-24 | 2020-12-25 | 中国科学院理化技术研究所 | Air valve adjusting method and air valve device |
| CN111271814A (en) * | 2019-07-22 | 2020-06-12 | 宁波奥克斯电气股份有限公司 | Refrigerant flow control method and device and air conditioner |
| WO2021169059A1 (en) * | 2020-02-25 | 2021-09-02 | 青岛海尔空调电子有限公司 | Method for controlling fixed-frequency air conditioner in refrigeration state |
| CN113375319A (en) * | 2020-02-25 | 2021-09-10 | 青岛海尔空调电子有限公司 | Control method of fixed-frequency air conditioner in refrigeration state |
| CN111365905A (en) * | 2020-04-09 | 2020-07-03 | 上海泰达冷暖科技有限公司 | Heat exchanger, gas-liquid separator, refrigerating system, manufacturing method and application of heat exchanger |
| CN111609533A (en) * | 2020-05-22 | 2020-09-01 | 海信（山东）空调有限公司 | Control method and device of electronic expansion valve |
| CN112524773B (en) * | 2020-12-09 | 2022-03-18 | 珠海格力电器股份有限公司 | Method and device for determining opening of electronic expansion valve |
| CN112524773A (en) * | 2020-12-09 | 2021-03-19 | 珠海格力电器股份有限公司 | Method and device for determining opening of electronic expansion valve |
| CN112710071A (en) * | 2020-12-28 | 2021-04-27 | 宁波奥克斯电气股份有限公司 | Method and device for controlling adjusting speed of electronic expansion valve and multi-split air conditioning system |
| CN112710071B (en) * | 2020-12-28 | 2022-07-26 | 宁波奥克斯电气股份有限公司 | Method and device for controlling adjusting speed of electronic expansion valve and multi-split air conditioning system |
| CN113819690A (en) * | 2021-08-10 | 2021-12-21 | 北京金茂绿建科技有限公司 | Heat pump system and electronic expansion valve control method |
| CN113959080A (en) * | 2021-09-30 | 2022-01-21 | 青岛海尔空调电子有限公司 | Control method for electronic expansion valve of air conditioning unit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102954555B (en) | 2014-09-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102954555B (en) | Method for controlling opening of expansion valve | |
| CN110470032B (en) | Air outlet temperature control method and device, air conditioner and computer readable storage medium | |
| CN102901293B (en) | The air-conditioner of fine adjustment electric expansion valve and control method thereof | |
| CN105241029A (en) | Operation control method for radiation air conditioner | |
| CN107300243B (en) | Air-conditioning system, wind file adjusting method and computer readable storage medium | |
| US20080216500A1 (en) | System and method for controlling an air conditioner or heat pump | |
| CN103277876A (en) | Control method of electronic expansion valve in air conditioner system | |
| CN106440440B (en) | The hot-gas bypass control method and system of screw unit | |
| CN103375871A (en) | Automatic air-conditioning system capacity adjusting method | |
| CN104791954A (en) | Control method and system for defrosting judgment of air conditioner | |
| CN102278820A (en) | Constant-temperature-type gas water heater control system with rapid and accurate temperature-regulating characteristic and control method | |
| CN103292432A (en) | Method and device for accurately regulating electronic expansion valve and temperature-accurately-regulated air conditioner | |
| WO2023124011A1 (en) | Method and apparatus for controlling electronic expansion valve, air conditioner and storage medium | |
| CN113719964B (en) | Air conditioner control method and device and air conditioner | |
| CN113803843A (en) | Multi-split refrigeration system control method and device, multi-split refrigeration system and air conditioner | |
| CN110094838B (en) | Variable parameter model-free self-adaptive control method based on air conditioning system | |
| CN201964703U (en) | Energy regulator for refrigerating machine set and refrigerating system | |
| CN110925941A (en) | Fan coil water temperature control method and device and air conditioning system | |
| CN110057034B (en) | Air conditioner control method and device and computer storage medium | |
| EP3563097B1 (en) | A variable speed compressor based ac system and control method | |
| CN110425687B (en) | Refrigerant adjusting method, refrigerant adjusting controller and air conditioning system | |
| Brener et al. | Two-dimensional dendritic growth at arbitrary Peclet number | |
| CN104101140A (en) | Freezer or refrigerator and refrigeration system thereof | |
| CN110567092A (en) | temperature control method and system applied to air handling unit | |
| CN109114749B (en) | Control method and device for air conditioning system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20161206 Address after: Three Hangzhou economic and Technological Development Zone, No. 12, No. 289, No. 310008, Zhejiang Industrial Park Patentee after: Hangzhou Xiantu Electronic Co., Ltd. Address before: 312500 Liquan village of Chengguan Zhejiang city of Shaoxing province Xinchang County town Patentee before: Zhejiang Sanhua Group Co., Ltd. |