CN102620388A - Method for limiting operating speed of compressor of air conditioner - Google Patents
Method for limiting operating speed of compressor of air conditioner Download PDFInfo
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- CN102620388A CN102620388A CN2012101217223A CN201210121722A CN102620388A CN 102620388 A CN102620388 A CN 102620388A CN 2012101217223 A CN2012101217223 A CN 2012101217223A CN 201210121722 A CN201210121722 A CN 201210121722A CN 102620388 A CN102620388 A CN 102620388A
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Abstract
The invention discloses a method for limiting the operating speed of a compressor of an air conditioner. The method comprises the following steps of: when outdoor environment temperature is lower than 10 DEG C and the air conditioner operates in a heating mode, limiting the minimum operating speed of the compressor; if the outdoor environment temperature Ta is not more than 5 DEG C, limiting the lower limit value of the operating speed of the compressor to be Nlower1; if the outdoor environment temperature Ta is more than 5 DEG C and not more than 10 DEG C, limiting the lower limit value of the operating speed of the compressor to be Nlower2; and setting different conditions for valuing principles of the Nlower1 and the Nlower2. The method has the advantages that the operating speed of the compressor is limited by the air conditioner according to difference of the outdoor environment temperature, and by limiting the minimum operating speed of the compressor, the problem of unsmooth oil return of a system caused by over-low circulation quantity of a refrigerant is solved, so a lubricating effect of the compressor is ensured, and the reliability of the compressor which operates at low temperature is improved.
Description
Technical field
The invention belongs to air-conditioning and Refrigeration Engineering technical field, specifically, relate to a kind of method that is used to limit the cooler compressor running speed.
Background technology
Along with warming gradually of terrestrial climate and improving constantly of people's living standard, the air-conditioning product has progressively been come into huge numbers of families, and the scope of application is day by day extensive.Existing air-conditioning product generally all comprises indoor set and off-premises station two parts, and when the residing environment temperature of off-premises station was low, the demand that heats obviously increased.And because when heating operation reaches perhaps near design temperature; Can there be the situation of low cruise in compressor; The problem that the lubricating oil that may occur causing compressor to spue owing to refrigerant circulation is too small this moment can not return thus can be to the serious harmful effect of reliability service generation of the lubricant effect and the compressor of compressor.
Summary of the invention
The present invention is in order to solve existing air-conditioning product than under the low ambient temperature during heating operation; The disadvantageous problem of compressor oil return appears easily; A kind of method according to environment temperature limit compression machine running speed has been proposed, to improve compressor reliability of operation under cryogenic conditions.
For solving the problems of the technologies described above, the present invention adopts following technical scheme to be achieved:
A kind of method that limits the compressor of air conditioner running speed operates in heating mode following time when outdoor environment temperature is lower than 10 ℃ and air-conditioner, and the minimum running speed of compressor is carried out with limit:
If outdoor environment temperature Ta≤5 ℃, the lower limit that then limits said compressor operating rotating speed is Nlower1, and the value principle of said Nlower1 is a compressor when in this interval, moving, and satisfies following two conditions simultaneously:
(1-1) compressor bottom temp-condenser medium temperature >=5 ℃;
(1-2) Nlower1 >=compressor free-running operation minimum speed+5rps;
If 5 ℃ of outdoor environment temperatures Ta≤10 ℃, and the lower limit that then limits said compressor operating rotating speed is Nlower2, the value principle of said Nlower2 is a compressor when in this interval, moving, and satisfies following two conditions simultaneously:
(2-1) compressor bottom temp-condenser medium temperature >=5 ℃;
(2-2) Nlower2 >=compressor free-running operation minimum speed.
In order to ensure the compressor safe operation; Make on its minimum speed that operates in compressor permission operation all the time; Then said Nlower2 is done further to limit, that is, if the lower limit Nlower2 of the compressor operating rotating speed of under the situation that satisfies said condition (2-1), (2-2), determining is less than Nlower3; Said Nlower3 is minimum speed+15rps that compressor allows operation, then limits Nlower2=Nlower3.
Preferably, the preferred value in the scope of 30rps to 40rps of said Nlower1; Said Nlower2 is value in the scope of 25rps to 35rps preferably.As one group of optimum recommendation, said Nlower1=35rps is set; Said Nlower2=30rps.
Further, described outdoor environment temperature Ta is that air-conditioner outdoor unit starts operation and reaches after the setting value T detected outside atmosphere convection temperature running time.
Preferably, said setting value T is preferably 60 seconds.
Further again, when said outdoor environment temperature Ta was higher than 10 ℃, the lower limit Nlower3 of limit compression machine running speed was minimum speed+15rps that compressor allows operation.
For the stability of raising system control, in said compressor operating process, when outdoor environment temperature Ta gets between the different temperatures dividing regions of setting, adopt the running speed of return difference control mode control compressor.
Preferably, it is 2 ℃ that the return difference temperature is set, and in said compressor operating process, when said outdoor environment temperature Ta dropped to 9 ℃ process gradually from 11 ℃, keeping the lower limit of compressor operating rotating speed was Nlower3; When outdoor environment temperature Ta continued to descend and is lower than 9 ℃, the lower limit of limit compression machine running speed was Nlower2; When outdoor environment temperature Ta dropped to 4 ℃ process gradually from 6 ℃, keeping the lower limit of compressor operating rotating speed was Nlower2; When outdoor environment temperature Ta continued to descend and is lower than 4 ℃, the lower limit of limit compression machine running speed was Nlower1.
Further again; In the process of the said compressor operating of control; At first calculate the running speed of compressor according to indoor environment temperature and design temperature; If during the lower limit of the compressor operating rotating speed that the running speed that calculates is limited in being lower than between the temperature dividing regions of current outdoor environment temperature Ta place, just the running speed to compressor limits.
Compared with prior art; Advantage of the present invention with good effect is: air-conditioner of the present invention limits according to the different running speeds to compressor of outdoor environment temperature; When outdoor environment temperature lower; And air-conditioner is operated in heating operation pattern following time, limits through the minimum operation rotating speed to compressor, to avoid owing to the too small generation that causes the unfavorable problem of system oil return of the internal circulating load of refrigerant; Thereby guaranteed the lubricant effect of compressor, improved compressor reliability of operation under cryogenic conditions.
Description of drawings
Fig. 1 is the program flow diagram of a kind of embodiment of compressor of air conditioner running speed method for limiting proposed by the invention;
Fig. 2 is that air-conditioner operates under the heating mode, the corresponding relation figure between outdoor environment temperature and the compressor operating rotating speed lower limit.
The specific embodiment
Describe in detail below in conjunction with the accompanying drawing specific embodiments of the invention.
The present invention can be operated under the heating mode in order to make the air-conditioning product under the lower situation of outdoor environment temperature, (be generally less than 10 ℃) safer, reliably; A kind of design that the running speed of compressor is artificially limited has been proposed; Limit the internal circulating load of refrigerant through the running speed of limit compression machine; And then the lubricating oil that spues of the compressor of avoiding occurring causing owing to refrigerant circulation is too small can not return problem and takes place; Not only guarantee the lubricant effect of compressor thus, and improved the reliability of compressor operating.
Come to set forth in detail the concrete design cycle of said compressor of air conditioner running speed method for limiting below through a concrete embodiment.
Embodiment one; Referring to shown in Figure 2; The compressor of air conditioner running speed method for limiting of present embodiment is employed in outdoor environment temperature Ta≤5 ℃ and 5 ℃, and < in ℃ of two temperature ranges in Ta≤10, the mode of giving setting value to the lower limit of compressor operating rotating speed respectively designs.That is, when under the situation of air-conditioner in outdoor environment temperature Ta≤5 ℃ during heating operation, the minimum running speed of limit compression machine is Nlower1; < during heating operation, the minimum running speed of limit compression machine is Nlower2 under the situation of Ta≤10 ℃ 5 ℃ of outdoor environment temperatures when air-conditioner.Value through choose reasonable Nlower1 and Nlower2; Even make compressor when heating operation reaches perhaps near design temperature, also can keep certain speed of service; Just can avoid occurring the disadvantageous problem of compressor oil return that causes because of refrigerant circulation is too small thus, and then improve the reliability of compressor operating.
In the present embodiment, described outdoor environment temperature Ta can detect acquisition through the temperature sensor system that is arranged in the air-conditioner outdoor unit.Detected outdoor environment temperature Ta generally is divided into two states through the temperature sensor in the off-premises station: a kind of Ta of being (ON state); A kind of is Ta (OFF state).Wherein, Ta (ON state) is meant when the air-conditioner outdoor fan starts operation and surpasses setting value T running time, the detected outdoor environment temperature value of temperature sensor, i.e. outside atmosphere convection temperature.Ta (OFF state) is meant that the air-conditioner outdoor fan stops or running time during less than setting value T, the detected outdoor environment temperature value of temperature sensor, the i.e. static temperature of outside atmosphere.
In the present embodiment, said setting value T recommends to choose 60 seconds, with the accuracy that guarantees that the outside atmosphere convection temperature detects.Certainly, said setting value T also can select other numerical value, as long as can guarantee that outdoor fan moves fully, realizes that the accurate detection of outside atmosphere convection temperature gets final product.
The method for limiting of the following compressor of air conditioner running speed that proposes all is meant the method for limiting of under Ta (ON state) situation, formulating, and promptly starts according to air-conditioner outdoor unit to reach the compressor operating rotating speed method for limiting that the later on detected outdoor environment temperature Ta of setting value T formulates running time.When in air-conditioner outdoor fan running time during, promptly during Ta (OFF state), the running speed of compressor is not limited less than setting-up time T.
When outdoor environment temperature Ta is lower than under 10 ℃ the situation heating operation, occur the disadvantageous problem of oil return for fear of compressor, present embodiment carries out with limit, that is: the minimum running speed of compressor
If outdoor environment temperature Ta≤5 ℃, then the lower limit of limit compression machine running speed is Nlower1, and the value principle of Nlower1 is compressor when in this temperature range, moving, and satisfies following two conditions simultaneously:
（1-1）BSH≥5℃；
(1-2) Nlower1 >=compressor free-running operation minimum speed+5rps.
If 5 ℃ of outdoor environment temperatures Ta≤10 ℃, the lower limit that then limits said compressor operating rotating speed is Nlower2, and the value principle of Nlower2 is compressor when in this temperature range, moving, and satisfies following two conditions simultaneously:
（2-1）BSH≥5℃；
(2-2) Nlower2 >=compressor free-running operation minimum speed.
Wherein, BSH is meant the difference of compressor bottom temp and condenser medium temperature; Compressor free-running operation minimum speed is meant under the condition that satisfies air-conditioner service requirement (refer generally to set up high-low pressure pressure reduction, meet air-conditioner vibration and require), the minimum speed that compressor can be continuously, normally move.Thus, even if indoor temperature near or when reaching design temperature, also can keep certain refrigerant circulation, the lubricating oil that compressor is spued can in time return, and avoids influencing the lubricant effect of compressor.
Be higher than 10 ℃ situation for outdoor environment temperature Ta; In order further to guarantee the security of compressor operating; Present embodiment preferably is set at Nlower3 with the lower limit of this temperature range inner compressor running speed, and said Nlower3=compressor allows the minimum speed+15rps of operation.Wherein, said compressor allows the minimum speed of operation, is meant under compressor self mechanical condition, the minimum speed that can allow compressor to carry out continuously, normally move, and this parameter value can be found from the specifications that compressor manufacturer provides.Certainly, can be higher than 10 ℃ of running speeds under the situation at outdoor environment temperature Ta to compressor yet and not limit, present embodiment does not specifically limit this.
Below in conjunction with flow chart shown in Figure 1, the idiographic flow of the compressor operating rotating speed method for limiting of present embodiment is set forth in detail:
S101, judge whether air-conditioner is operated under the heating operation pattern, if then carry out subsequent step; Otherwise, withdraw from the limit procedure of this compressor operating rotating speed.
S102, judge the state of detected outdoor environment temperature Ta,, then judge the temperature range that outdoor environment temperature Ta falls into, if Ta≤5 ℃, then execution in step S103 if the state of Ta is set to the ON state; < Ta≤10 ℃, then execution in step S104 if 5 ℃; If Ta>10 ℃, execution in step S105 then.If the state of Ta is set to the OFF state, then withdraw from this compressor operating rotating speed limit procedure.
Here, can confirm out according to its startup ruuning situation by the processor on the air-conditioner mainboard to being provided with of Ta state to outdoor fan.
The lower limit of the running speed of S103, limit compression machine is Nlower1, jumps to step S106;
In this step, the value of said Nlower1 can adopt following experimental technique to confirm:
Under different outdoor environment temperatures, and said outdoor environment temperature is all smaller or equal to 5 ℃ with the off-premises station heating operation of air-conditioner;
Change the running speed of compressor, and detect the compressor bottom temp of air-conditioner and the medium temperature of condenser simultaneously;
Satisfy at the same time: (1) BSH >=5 ℃; (2) under the situation of Nlower1 >=these two conditions of compressor free-running operation minimum speed+5rps, determine the minimum running speed Nlower1 of compressor.
In the present embodiment, said Nlower1 is value in the scope of 30rps to 40rps preferably, recommends Nlower1 is set at 35rps, to improve the control effect.
When calculating the running speed of compressor, at first calculate the running speed N of compressor according to the traditional calculating formula according to user's setting temperature and indoor temperature; Whether judge N then greater than Nlower1, if, the running speed N control compressor operating that then calculates according to traditional calculating formula; Otherwise, restriction N=Nlower1.
The lower limit of the running speed of S104, limit compression machine is Nlower2, jumps to step S106;
In this step, the value of said Nlower2 can adopt following experimental technique to confirm:
Under different outdoor environment temperatures, and said outdoor environment temperature is all in 5 ℃ to 10 ℃ temperature range with the off-premises station heating operation of air-conditioner;
Change the running speed of compressor, and detect the compressor bottom temp of air-conditioner and the medium temperature of condenser simultaneously;
Satisfy at the same time: (1) BSH >=5 ℃; (2) under the situation of Nlower2 >=these two conditions of compressor free-running operation minimum speed, determine the minimum running speed Nlower2 of compressor.
In addition, if the minimum running speed Nlower2 that under the situation that satisfies said condition (1), (2), determines is lower than minimum speed+15rps that compressor allows operation, promptly < Nlower3 then sets Nlower2
The Nlower2=Nlower3=compressor allows the minimum speed+15rps of operation.
In the present embodiment, said Nlower2 is value in the scope of 25rps to 35rps preferably, recommends Nlower2 is set at 30rps, to improve the control effect.
When confirming the value of Nlower1, Nlower2, should satisfy the requirement of Nlower1-Nlower2 >=5rps.
Same, when calculating the running speed of compressor, at first calculate the running speed N of compressor according to the traditional calculating formula according to user's setting temperature and indoor temperature; Whether judge N then greater than Nlower2, if, the running speed N control compressor operating that then calculates according to traditional calculating formula; Otherwise, restriction N=Nlower2.
The lower limit of the running speed of S105, limit compression machine is Nlower3;
In this step, the value of said Nlower3 can adopt following formula to confirm:
The Nlower3=compressor allows the minimum speed+15rps of operation.
In like manner, at outdoor environment temperature Ta>when calculating the running speed of compressor under 10 ℃ the situation, at first calculate the running speed N of compressor according to the traditional calculating formula according to user's setting temperature and indoor temperature; Whether judge N then greater than Nlower3, if, the running speed N control compressor operating that then calculates according to traditional calculating formula; Otherwise, restriction N=Nlower3.
S106, return step S101 and continue to detect carry out.
In the compressor operating rotating speed method for limiting that present embodiment designed; Stability for the control of raising system; In said compressor operating process; When outdoor environment temperature Ta descends between the different temperatures dividing regions that gets into setting gradually, preferably adopt the return difference control mode that the lower limit of compressor operating rotating speed is controlled.As a kind of preferred design; Suppose the return difference temperature is set at 2 ℃; In said compressor operating process; When outdoor environment temperature Ta drops to 9 ℃ process gradually from 11 ℃, rush the lower limit of the running speed of compressor is switched to Nlower2 by Nlower3, but the lower limit that keeps the compressor operating rotating speed is still on Nlower3; When outdoor environment temperature continues to descend and is lower than 9 ℃, again the lower limit of compressor operating rotating speed is adjusted to Nlower2.In like manner, when outdoor environment temperature Ta dropped to 4 ℃ process gradually from 6 ℃, keeping the lower limit of compressor operating rotating speed was Nlower2; When outdoor environment temperature continued to descend and is lower than 4 ℃, the lower limit with the compressor operating rotating speed was adjusted into Nlower1 again.
Otherwise,, still adopt the return difference control mode that the lower limit of compressor operating rotating speed is controlled for the process that outdoor environment temperature rises gradually.Promptly in said compressor operating process, when outdoor environment temperature Ta rose to 6 ℃ process gradually from 4 ℃, keeping the lower limit of compressor operating rotating speed still was Nlower1; When outdoor environment temperature continues to rise and is higher than 6 ℃, again the lower limit of compressor operating rotating speed is adjusted to Nlower2.In like manner, when outdoor environment temperature Ta rose to 11 ℃ process gradually from 9 ℃, keeping the lower limit of compressor operating rotating speed was Nlower2; When outdoor environment temperature continued to rise and is higher than 11 ℃, the lower limit with the compressor operating rotating speed was adjusted into Nlower3 again.
Adopt the stability that the return difference control strategy can the control of assurance system.Certainly, said return difference temperature also can be set at other suitable temperature values, and present embodiment does not specifically limit this.
Certainly, present embodiment is not limited in above giving an example for the division of three temperature ranges, also can adopt other dividing mode, can confirm according to the practical operation situation experiment of air-conditioner.
In the present invention, detect acquisition outdoor environment temperature Ta through the temperature sensor in the air-conditioner outdoor unit and can transfer to the processor on the air-conditioner mainboard, for example host CPU chip in real time.Compressor operating rotating speed restriction strategy proposed by the invention mode through software programming is write processor; And then calculate each running speed of compressor constantly through processor; And the generation control signal corresponding, via the safe operation of driving circuit drives compressor.
Certainly; The above only is a kind of preferred implementation of the present invention; 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 make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (10)
1. method that limits the compressor of air conditioner running speed is characterized in that: operate in heating mode following time when outdoor environment temperature is lower than 10 ℃ and air-conditioner, the minimum running speed of compressor is carried out with limit:
If outdoor environment temperature Ta≤5 ℃, the lower limit that then limits said compressor operating rotating speed is Nlower1, and the value principle of said Nlower1 is a compressor when in this interval, moving, and satisfies following two conditions simultaneously:
(1-1) compressor bottom temp-condenser medium temperature >=5 ℃;
(1-2) Nlower1 >=compressor free-running operation minimum speed+5rps;
If 5 ℃ of outdoor environment temperatures Ta≤10 ℃, and the lower limit that then limits said compressor operating rotating speed is Nlower2, the value principle of said Nlower2 is a compressor when in this interval, moving, and satisfies following two conditions simultaneously:
(2-1) compressor bottom temp-condenser medium temperature >=5 ℃;
(2-2) Nlower2 >=compressor free-running operation minimum speed.
2. the method for restriction compressor of air conditioner running speed according to claim 1; It is characterized in that: if the lower limit Nlower2 of the compressor operating rotating speed of under the situation that satisfies said condition (2-1), (2-2), determining is less than Nlower3; Said Nlower3 is minimum speed+15rps that compressor allows operation, then limits Nlower2=Nlower3.
3. the method for restriction compressor of air conditioner running speed according to claim 2 is characterized in that: the span of said Nlower1 is 30rps to 40rps; The span of said Nlower2 is 25rps to 35rps.
4. the method for restriction compressor of air conditioner running speed according to claim 3 is characterized in that: said Nlower1=35rps; Said Nlower2=30rps.
5. the method for restriction compressor of air conditioner running speed according to claim 1 is characterized in that: described outdoor environment temperature Ta is that air-conditioner outdoor unit starts operation and reaches after the setting value T detected outside atmosphere convection temperature running time.
6. the method for restriction compressor of air conditioner running speed according to claim 5 is characterized in that: said setting value T=60 second.
7. according to the method for each described restriction compressor of air conditioner running speed in the claim 1 to 6; It is characterized in that: when said outdoor environment temperature Ta was higher than 10 ℃, the lower limit Nlower3=compressor of limit compression machine running speed allowed the minimum speed+15rps of operation.
8. the method for restriction compressor of air conditioner running speed according to claim 7; It is characterized in that: in said compressor operating process; When outdoor environment temperature Ta gets between the different temperatures dividing regions of setting, adopt the running speed of return difference control mode control compressor.
9. the method for restriction compressor of air conditioner running speed according to claim 8; It is characterized in that: it is 2 ℃ that the return difference temperature is set; In said compressor operating process; When said outdoor environment temperature Ta dropped to 9 ℃ process gradually from 11 ℃, keeping the lower limit of compressor operating rotating speed was Nlower3; When outdoor environment temperature Ta continued to descend and is lower than 9 ℃, the lower limit of limit compression machine running speed was Nlower2; When outdoor environment temperature Ta dropped to 4 ℃ process gradually from 6 ℃, keeping the lower limit of compressor operating rotating speed was Nlower2; When outdoor environment temperature Ta continued to descend and is lower than 4 ℃, the lower limit of limit compression machine running speed was Nlower1.
10. the method for restriction compressor of air conditioner running speed according to claim 7; It is characterized in that: in the process of the said compressor operating of control; At first calculate the running speed of compressor according to indoor environment temperature and design temperature; If during the lower limit of the compressor operating rotating speed that the running speed that calculates is limited in being lower than between the temperature dividing regions of current outdoor environment temperature Ta place, just the running speed to compressor limits.
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| CN103029715A (en) * | 2012-12-31 | 2013-04-10 | 石家庄国祥运输设备有限公司 | Indoor temperature control method of subway vehicle |
| CN104515249A (en) * | 2013-09-27 | 2015-04-15 | 珠海格力电器股份有限公司 | Operation control method and device for air-conditioning system and air-conditioning system |
| CN104006504B (en) * | 2014-06-19 | 2017-02-15 | 广东志高空调有限公司 | Variable frequency air conditioner low-frequency operating control method and control device |
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| CN106931795A (en) * | 2015-12-29 | 2017-07-07 | 赵联众 | A kind of new gas industry stove heating means |
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| CN107676263A (en) * | 2017-10-30 | 2018-02-09 | 广东美的制冷设备有限公司 | Compressor control system, transducer air conditioning |
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| CN110375411A (en) * | 2019-07-17 | 2019-10-25 | 广东Tcl智能暖通设备有限公司 | Starting of air conditioner control method, air-conditioning and storage medium |
| CN111854110A (en) * | 2020-07-07 | 2020-10-30 | 三菱重工海尔(青岛)空调机有限公司 | Method for controlling air conditioner to be comfortable in air outlet |
| CN111854110B (en) * | 2020-07-07 | 2022-06-17 | 三菱重工海尔(青岛)空调机有限公司 | Method for controlling air conditioner to be comfortable in air outlet |
| CN113511049A (en) * | 2021-05-20 | 2021-10-19 | 重庆长安汽车股份有限公司 | Self-adaptive multi-section constant-rotating-speed automobile air conditioner compressor control system and method |
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