CN103206820B - Expansion valve opening controlling method for preventing oscillating of expansion valve - Google Patents
Expansion valve opening controlling method for preventing oscillating of expansion valve Download PDFInfo
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- CN103206820B CN103206820B CN201310151181.3A CN201310151181A CN103206820B CN 103206820 B CN103206820 B CN 103206820B CN 201310151181 A CN201310151181 A CN 201310151181A CN 103206820 B CN103206820 B CN 103206820B
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Abstract
The invention provides an expansion valve opening controlling method for preventing the oscillating of an expansion valve, which aims at solving the problem of valve oscillating caused by the factors that the regulating steps of the valve are fluctuated and a system is controlled misorderly due to the lagging influence of the system in existing expansion valve opening control. The expansion valve opening controlling method comprises the following steps of: S1. setting target superheat degree and standard valve opening; S2. initiating the valve, setting the valve opening as the standard opening after a compressor is started; S3. judging whether the starting time of the compressor achieves t1, and if yes, executing the S4; S4. determining the practical superheat degree of the valve after t1; S5. determining the superheat degree SH, controlling and regulating the valve opening of the expansion valve according to the difference delta SH between the current superheat degree SH and the superheat degree SH' at the last moment; S6. regulating the step number of the valve to be 1 or minus 1 after the compressor continuously runs for a certain time t (t is larger than t1) and within the time t2 after the absolute SH is equal to 0 and retreating is carried out; and S7. after the time t2, returning the S4. With the expansion valve opening controlling method, the valve oscillating phenomenon due to improper valve regulating steps can be avoided, and the system can safely and reliably run.
Description
Technical field
The present invention relates to air-conditioning expansion valve, be specifically related to have the expansion valve opening control method preventing expansion valve vibration wave action.
Background technology
Convertible frequency air-conditioner generally uses expansion valve to regulate the flow of refrigerant to be suitable for accurately, at a high speed, significantly to regulate the needs of load, usual employing detects the temperature of compressor return air mouth and the difference of indoor set coil temperature, calculate the aperture that the degree of superheat controls expansion valve, realize the automatic adjustment of cold medium flux.
The aperture of electric expansion valve regulates and is driven by stepper motor, and the minimum angles scope that stepper motor rotates is called a step, and therefore, it is all weigh by " step " that the aperture of electric expansion valve regulates generally.The aperture of such as expansion valve is 200 steps, and namely stepper motor drives expansion valve to turn to the 200th angular unit.
Current this control mode has following shortcoming and defect: Systematical control has certain hysteresis quality, mainly through detection system sensor temperature, and system temperature change (feedback signal) needs the regular hour, the degree of superheat under complex environment adjusts valve step number not necessarily the most accurate and suitable, expansion valve is easily adjusted excessive, the Rapid Variable Design of temperature adds that the delayed valve adjustment step number that makes of feedback signal fluctuates up and down, Systematical control can be made disorderly, cause expansion valve to vibrate and fluctuate.Expansion valve vibration generally shows as the fluctuation of valve opening, complete machine power, efficiency, makes the work that system can not be stable.
Summary of the invention
The invention provides a kind of expansion valve opening control method preventing expansion valve from vibrating, can solve in the aperture control of prior art expansion valve, due to the Rapid Variable Design of temperature and the hysteresis quality impact of system, make valve adjust step number and fluctuate up and down, Systematical control is disorderly, causes the problem that expansion valve vibrates.
For reaching the object solved the problems of the technologies described above, the present invention is achieved by the following technical solutions: a kind of expansion valve opening control method preventing expansion valve from vibrating, described expansion valve is arranged in the refrigerant circulation circuit of equipment, also be provided with evaporimeter and compressor in described closed circuit, comprise the steps:
S1, setting target superheat degree, the reference opening amount of expansion valve;
S2, compressor are opened, and start expansion valve, and the aperture of expansion valve are set to the reference opening amount of setting after compressor is opened;
S3, judge whether the opening time of compressor reaches t1, if so, perform step S4;
S4, according to the outlet temperature of evaporimeter and the difference of inlet temperature, determine the actual degree of superheat of expansion valve;
S5, determine the difference of the described actual degree of superheat and target superheat degree to obtain degree of superheat SH, according to current degree of superheat SH and with the difference △ SH of a upper moment degree of superheat SH ' to the aperture of the control and regulation expansion valve of expansion valve;
S6, compressor run certain hour t(t > t1 continuously) after, and | SH|=0 exits in the rear t2 time, and the step number of variable expansion valve is+1 or-1;
S7, after the t2 time, return step S4.
In the inventive solutions, following additional technical feature is also comprised:
In step S6, the tune valve cycle of expansion valve is 60s/1 time or 10s/1 time.
Described in step S5 according to current degree of superheat SH and with the difference △ SH of a upper moment degree of superheat SH ' to the aperture of the control and regulation expansion valve of expansion valve, regulative mode is as follows:
1. | during SH|=0, adjust the valve cycle to be 60s/1 time, adjust valve step number to be-1,0 or 1;
2. | SH| >=3 and △ SH=0 time, adjust the valve cycle to be 10s/1 time, tune valve step number is-2 ,-1,2 or 3;
3. | when SH|, △ SH is other values, adjust the valve cycle to be 30s/1 time, adjust valve step number to be-4 ,-3 ,-2 ,-1,1,2 or 3.
Between step S5 and step S6, also comprise the step S ' whether detection system has compressor exhaust temperature to revise the expansion valve degree of superheat and aperture, if without correction, perform step S6.
Whether described detection system has compressor exhaust temperature to comprise the steps: the step that the expansion valve degree of superheat and aperture are revised
1) whether the duration of runs detecting described compressor was in the t1 time, and whether the aperture of expansion valve reaches higher limit, does not if so, revise, and performed step S6, if not, continued to perform following step 2);
2) judgement system is in and heats running or cooling operation;
If heat running, and delivery temperature Ttc >=98 ~ 110 DEG C of compressor, be+1 ~+10 to the aperture correction step number of described expansion valve; Delivery temperature Ttc < 98 ~ 110 DEG C, performs step S4;
If cooling operation, and compressor exhaust temperature Ttc >=98 ~ 110 DEG C, be+1 ~+8 to the aperture correction step number of described expansion valve, be reduced to 88 ~ 95 DEG C to delivery temperature Ttc; During delivery temperature Ttc≤88 ~ 95 DEG C, be-5 ~ 0 to the aperture correction step number of described expansion valve, be increased to 98 ~ 110 DEG C to delivery temperature Ttc; Then, the correction of above-mentioned cooling operation is repeated.
Heating in running, is 30s/1 time, in cooling operation to the aperture correction cycle of described expansion valve, is 120s/1 time to the aperture correction cycle of described expansion valve.
The value of described t1 is 3 ~ 10min, and the value of described t is 15 ~ 30min.
The value of described t2 is 2 ~ 10min.
Described target superheat degree is-1,0,1,2 or 3.
Described reference opening amount is 100 ~ 480 steps.
Compared with prior art, adopt control method of the present invention, when occurring that valve vibrates, the degree of superheat is each step number adjusting valve of zero restriction immediately, avoids adjusting the improper valve oscillatory occurences caused of valve step number, the operation safely and reliably of safeguards system.
Accompanying drawing explanation
Fig. 1 is the control flow chart of preferred embodiment;
The aperture of the expansion valve of Fig. 2 corresponding to SH, △ SH value different in preferred embodiment regulates step number table, and the unit of SH, △ SH is DEG C.
Detailed description of the invention
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
With reference to Fig. 1, the expansion valve opening control method that the present embodiment prevents expansion valve from vibrating, expansion valve is arranged in the refrigerant circulation circuit of air-conditioner, is also provided with evaporimeter and compressor in closed circuit, and this control method comprises the steps:
S1, setting target superheat degree, the reference opening amount of expansion valve; In this step, target superheat degree can be-1,0,1,2 or 3, and concrete value is determined according to concrete system; The value of reference opening amount can be selected in 100 ~ 480 steps, and concrete value is determined according to concrete system, and in the present embodiment, the reference opening amount of expansion valve is set as 280 steps.
S2, expansion valve initialize, and compressor is opened, and the aperture of expansion valve are set to reference opening amount 280 step of setting after compressor is opened;
S3, judge whether the opening time of compressor reaches t1, if so, perform step S4; In this step, the span of t1 is 3 ~ 10min, and in like manner, according to the concrete value of concrete system, in the present embodiment, t1 is 4min.
S4, according to the outlet temperature of evaporimeter and the difference of inlet temperature, determine the actual degree of superheat of expansion valve;
S5, get the difference of the actual degree of superheat and target superheat degree, obtain degree of superheat SH, according to current time degree of superheat SH, and the difference △ SH of current time degree of superheat SH and a upper moment degree of superheat SH ' is to the aperture of the control and regulation expansion valve of expansion valve, the tune valve step number namely calculated according to degree of superheat algorithm carries out tune valve;
S6, compressor run certain hour t(t > t1 continuously) after, now system enters steady-working state, | SH|=0 exits in the rear t2 time, the adjustment step number of expansion valve is restricted to+1 or-1, namely valve can only be adjusted length by length, avoid adjusting the improper valve oscillation problem that may cause of valve step number, the safe and reliable operation of safeguards system.In the present embodiment, t value is 15min, t2 value is 2min, can according to different system different value within the scope of 15 ~ 30min, 2 ~ 10min respectively.In addition, it is emphasized that, the adjustment step number of the expansion valve described in the present embodiment+(just) ,-(bearing) not mathematics proper+(just) ,-(bearing), but with the direction variable expansion valve to increase expansion valve opening, its step Numerical is+(just), to the direction variable expansion valve reducing expansion valve opening, its step Numerical is-(bearing).
S7, after the t2 time, return S4, continue the degree of superheat and adjust valve.
In step S6, the tune valve cycle of expansion valve is 60s/1 time or 10s/1 time.
In step S5, the described tune valve step number calculated according to degree of superheat algorithm carries out tune valve, and its concrete tune valve mode is as follows:
1. when | during SH|=0, adjust the valve cycle to be 60s/1 time, tune valve step number is-1,0 or 1; Concrete, with reference to shown in Fig. 2, when | during SH|=0, △ SH≤-2, when adjusting valve step number to be-1, △ SH=-1, when adjusting valve step number to be-1, △ SH=0, when adjusting valve step number to be 0, △ SH=1, when adjusting valve step number to be 1, △ SH >=2, adjust valve step number to be 1.
2. when | SH| >=3 and △ SH=0 time, adjust the valve cycle to be 10s/1 time, tune valve step number is-2 ,-1,2 or 3; Concrete, with reference to shown in Fig. 2, as △ SH=0, during SH=3, when adjusting valve step number to be 2, SH >=4, when adjusting valve step number to be 3, SH=-3, when adjusting valve step number to be-1, SH≤-4, adjust valve step number to be-2.
3. | when SH|, △ SH is other values, adjust the valve cycle to be 30s/1 time, adjust valve step number to be-4 ,-3 ,-2 ,-1,1,2 or 3, with reference to shown in Fig. 2.
Because compressor exhaust temperature Ttc is too high, system being made unstable, being in stable, safe and reliable operating mode for making system, compressor exhaust temperature can be revised the expansion valve degree of superheat and aperture, to reduce delivery temperature Ttc, if there is this to revise, no longer carry out the present embodiment control method.Therefore, between step S5 and step S6, also comprise the step S ' whether detection system has compressor exhaust temperature to revise to the expansion valve degree of superheat and aperture, if revise without this, perform step S6, revise if system exists this, the present embodiment control method is invalid.
Concrete, whether described detection system has compressor exhaust temperature to comprise the steps: the step that the expansion valve degree of superheat and aperture are revised
1) whether the duration of runs detecting described compressor was in the t1 time, did not if so, revise, and performed step S6, if not, continued to perform following step 2);
2) judgement system is in and heats running or cooling operation;
If heat running, and delivery temperature Ttc >=98 ~ 110 DEG C of compressor, be+1 ~+10 to the aperture correction-compensation step number of described expansion valve, when aperture reaches higher limit, compensate and no longer add, in the present embodiment, aperture higher limit is 480 steps; If delivery temperature Ttc < 98 ~ 110 DEG C, return and perform step S4, recover the degree of superheat and adjust valve;
If cooling operation, and compressor exhaust temperature Ttc >=98 ~ 110 DEG C, be+1 ~+8 to the aperture correction step number of described expansion valve, 88 ~ 95 DEG C are reduced to delivery temperature Ttc, namely, when delivery temperature Ttc is in 88 ~ 95 DEG C≤Ttc≤98 ~ 110 DEG C ,+1 ~+8 is remained on to the aperture correction step number of expansion valve; During delivery temperature Ttc≤88 ~ 95 DEG C,-5 ~ 0 is adjusted to the aperture correction step number of described expansion valve, be increased to 98 ~ 110 DEG C to delivery temperature Ttc, namely when delivery temperature Ttc is in 88 ~ 95 DEG C≤Ttc≤98 ~ 110 DEG C ,-5 ~ 0 remained on to the aperture correction step number of expansion valve; By that analogy, the correction of above-mentioned cooling operation is repeated.
Such as, if heat running, and delivery temperature Ttc >=102 DEG C of compressor, be+5 to the aperture correction-compensation step number of described expansion valve; If delivery temperature Ttc < 102 DEG C, returns step S4, recover the degree of superheat and adjust valve; If cooling operation, and compressor exhaust temperature Ttc >=103 DEG C, be+5 to the aperture correction step number of described expansion valve, be reduced to 90 DEG C to delivery temperature Ttc, namely, when delivery temperature Ttc is in 90 DEG C≤Ttc≤103 DEG C ,+5 are remained on to the aperture correction step number of expansion valve; During delivery temperature Ttc≤90 DEG C ,-1 is adjusted to the aperture correction step number of described expansion valve, is increased to 103 DEG C to delivery temperature Ttc, namely when delivery temperature Ttc is in 90 DEG C≤Ttc≤103 DEG C ,-1 is remained on to the aperture correction step number of expansion valve.
Based on technique scheme, optionally, heating in running, is 30s/1 time, in cooling operation to the aperture correction cycle of expansion valve, is 120s/1 time to the aperture correction cycle of expansion valve.And no matter be cooling operation or cooling operation, within correction total time, compensate the most as many as+50 of total step number and namely stop compensating.
The above is only preferred embodiment of the present invention, and be not restriction the present invention being made to other form, any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the Equivalent embodiments of equivalent variations.But everyly do not depart from technical solution of the present invention content, any simple modification, equivalent variations and the remodeling done above embodiment according to technical spirit of the present invention, still belong to the protection domain of technical solution of the present invention.
Claims (1)
1. prevent the expansion valve opening control method that expansion valve vibrates, described expansion valve is arranged in the refrigerant circulation circuit of equipment, is also provided with evaporimeter and compressor, it is characterized in that, comprise the steps: in described closed circuit
S1, setting target superheat degree, the reference opening amount of expansion valve;
S2, expansion valve initialize, and compressor is opened, and the aperture of expansion valve are set to the reference opening amount of setting after compressor is opened;
S3, judge whether the opening time of compressor reaches t1, if so, perform step S4;
S4, according to the outlet temperature of evaporimeter and the difference of inlet temperature, determine the actual degree of superheat of expansion valve;
S5, determine the difference of the described actual degree of superheat and target superheat degree to obtain degree of superheat SH, according to current degree of superheat SH and with the difference △ SH of a upper moment degree of superheat SH ' to the aperture of the control and regulation expansion valve of expansion valve, regulative mode is as follows:
1. | during SH|=0, adjust the valve cycle to be 60s/1 time, adjust valve step number to be-1,0 or 1;
2. | SH| >=3 and △ SH=0 time, adjust the valve cycle to be 10s/1 time, tune valve step number is-2 ,-1,2 or 3;
3. | when SH|, △ SH is other values, adjust the valve cycle to be 30s/1 time, adjust valve step number to be-4 ,-3 ,-2 ,-1,1,2 or 3;
S6, compressor run certain hour t(t > t1 continuously) after, and | SH|=0 exits in the rear t2 time, and the step number of variable expansion valve is+1 or-1;
S7, after the t2 time, return step S4.
2. the expansion valve opening control method preventing expansion valve from vibrating according to claim 1, is characterized in that, in step S6, the tune valve cycle of expansion valve is 60s/1 time or 10s/1 time.
3. the expansion valve opening control method preventing expansion valve from vibrating according to claim 1 and 2, it is characterized in that, between step S5 and step S6, also comprise the step S ' whether detection system has compressor exhaust temperature to revise expansion valve opening, if without correction, perform step S6.
4. the expansion valve opening control method preventing expansion valve from vibrating according to claim 3, is characterized in that, whether described detection system has compressor exhaust temperature to comprise the steps: the step that expansion valve opening is revised
1) whether the duration of runs detecting compressor was in the t1 time, did not if so, revise, and performed step S5, if not, continued to perform following step 2);
2) judgement system is in and heats running or cooling operation;
If heat running, and delivery temperature Ttc >=98 ~ 110 DEG C of compressor, be+1 ~+10 to the aperture correction-compensation step number of described expansion valve; Delivery temperature Ttc < 98 ~ 110 DEG C, performs step S4;
If cooling operation, and compressor exhaust temperature Ttc >=98 ~ 110 DEG C, be+1 ~+8 to the aperture correction-compensation step number of described expansion valve, be reduced to 88 ~ 95 DEG C to delivery temperature Ttc; During delivery temperature Ttc≤88 ~ 95 DEG C, be-5 ~ 0 to the aperture correction-compensation step number of described expansion valve, be increased to 98 ~ 110 DEG C to delivery temperature Ttc; Then, the correction of above-mentioned cooling operation is repeated.
5. the expansion valve opening control method preventing expansion valve from vibrating according to claim 4, it is characterized in that, heat in running, is 30s/1 time to the aperture correction cycle of described expansion valve, in cooling operation, it is 120s/1 time to the aperture correction cycle of described expansion valve.
6. the expansion valve opening control method preventing expansion valve from vibrating according to claim 4, is characterized in that, the value of described t1 is 3 ~ 10min, and the value of described t is 15 ~ 30min.
7. the expansion valve opening control method preventing expansion valve from vibrating according to claim 4, is characterized in that, the value of described t2 is 2 ~ 10min.
8. the expansion valve opening control method preventing expansion valve from vibrating according to claim 1, is characterized in that, described target superheat degree is-1,0,1,2 or 3.
9. the expansion valve opening control method preventing expansion valve from vibrating according to claim 1, is characterized in that, described reference opening amount is 100 ~ 480 steps.
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| CN201310151181.3A CN103206820B (en) | 2013-04-27 | 2013-04-27 | Expansion valve opening controlling method for preventing oscillating of expansion valve |
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| CN110360728A (en) * | 2019-08-05 | 2019-10-22 | 珠海格力电器股份有限公司 | Flow rate adjusting method, medium, device, equipment and air-conditioning |
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| CN102954555B (en) * | 2011-08-22 | 2014-09-10 | 浙江三花股份有限公司 | Method for controlling opening of expansion valve |
| CN103033004B (en) * | 2011-09-29 | 2016-03-30 | 杭州三花研究院有限公司 | A kind of control method of automotive air-conditioning system electric expansion valve |
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| CN110360728A (en) * | 2019-08-05 | 2019-10-22 | 珠海格力电器股份有限公司 | Flow rate adjusting method, medium, device, equipment and air-conditioning |
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