CN110553441A - Operation control method and system, readable storage medium, compression and air conditioning system - Google Patents
Operation control method and system, readable storage medium, compression and air conditioning system Download PDFInfo
- Publication number
- CN110553441A CN110553441A CN201910886103.5A CN201910886103A CN110553441A CN 110553441 A CN110553441 A CN 110553441A CN 201910886103 A CN201910886103 A CN 201910886103A CN 110553441 A CN110553441 A CN 110553441A
- Authority
- CN
- China
- Prior art keywords
- compressor
- compressed air
- operation control
- equal
- control method
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2115—Temperatures of a compressor or the drive means therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2115—Temperatures of a compressor or the drive means therefor
- F25B2700/21151—Temperatures of a compressor or the drive means therefor at the suction side of the compressor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2115—Temperatures of a compressor or the drive means therefor
- F25B2700/21152—Temperatures of a compressor or the drive means therefor at the discharge side of the compressor
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
the invention provides an operation control method, an operation control system, a computer readable storage medium, a compression system and an air conditioning system, wherein the operation control method comprises the following steps: acquiring an operating parameter of the compressor, and calculating the variable quantity of the operating parameter in a first time length; and adjusting the compressed air quantity of the compressor according to the variable quantity of the operation parameter in the first time length. The operation control method provided by the invention adjusts the compressed air quantity of the compressor based on the variation trend of the liquid carrying condition of the compressor. Under the condition that the liquid carrying condition of the compressor has a worsening trend, the liquid carrying condition of the compressor is relieved in a compressed air volume reducing mode, the requirement for higher accuracy can be met, the misoperation condition is avoided, and the stable operation of the compressor and a compression system is ensured.
Description
Technical Field
The invention relates to the technical field of compression, in particular to an operation control method, an operation control system, a computer readable storage medium, a compression system and an air conditioning system.
Background
In the case of a screw unit of a vapor compression cycle, lubricating oil for lubricating a rotor of a compressor circulates along with refrigerant, and after passing through a first-stage oil separator of the compressor and a second-stage oil separator in the system, liquid lubricating oil separated from the refrigerant flows back and is stored in an oil sump of the compressor. The main cause of oil spill is therefore liquid entrainment which reduces the separation effect of the oil separator and introduces too much lubricant into the refrigerant cycle, resulting in oil spill starvation and large volumes of refrigerant being introduced into the oil sump.
The conventional refrigerating machine energy regulation control method is realized by taking the water temperature required by a user as a target to carry out loading and unloading of unit energy regulation and matching with an adjustable throttle valve. If the unit is operated with liquid, the refrigerant circulation is controlled by the adjustable throttle valve. However, the above method still has the defects of mismatching of the refrigerant cycle, lag adjustment or poor adjustment of the throttle valve and the like, and further causes the machine set to run with liquid and run out of oil quickly to cause fault shutdown.
In the related art, after the existence of liquid carried in the compressor is detected, the adjustment of the compressor can be directly carried out, but the defects of misoperation and low control precision still exist, and the technical problems cannot be effectively solved.
disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art.
To this end, the first aspect of the invention provides an operation control method.
A second aspect of the invention provides an operation control system.
A third aspect of the invention provides a computer-readable storage medium.
a fourth aspect of the invention provides a compression system.
A fifth aspect of the present invention provides an air conditioning system.
A first aspect of the present invention provides an operation control method including: acquiring an operating parameter of the compressor, and calculating the variable quantity of the operating parameter in a first time length; and adjusting the compressed air quantity of the compressor according to the variable quantity of the operation parameter in the first time length.
The operation control method provided by the invention comprises the steps of firstly obtaining the operation parameters of the compressor, and calculating the change condition of the operation parameters of the compressor in a first time period; whether the liquid carrying condition of the compressor has a deterioration trend can be judged by calculating the change condition of the operation parameter in the first time length. When the liquid carrying condition has a deterioration trend, the gas carrying condition of the compressor can be relieved to a certain extent by adjusting the compressed gas quantity of the compressor, and the stable operation of a compression system is ensured. Particularly, the variable quantity of the running parameters of the compressor in the first time period is calculated, the variation trend of the liquid carrying condition is used as the judgment basis of the compressor regulation, the running state of the compressor is directly regulated by comparing and detecting the liquid carrying condition, the transient state caused by the fluctuation of the compression system can be avoided, the liquid carrying condition can be accurately judged, the requirement on higher accuracy can be met, the misoperation on the compressor is avoided, and the more stable running of the compressor and the whole compression system is ensured.
specifically, the variation of the compressor operation parameter in the first time period may be calculated by: acquiring the operation parameters of the compressor at a first time length starting time node and the operation parameters of a first time length ending time node, and further comparing to obtain the variation of the operation parameters; when the variation of the operation parameters exceeds a certain range, the liquid carrying condition of the compressor is judged to have a deterioration trend, at the moment, the compressed air quantity of the compressor needs to be adjusted, and the liquid carrying condition is relieved to a certain extent.
The operation control method provided by the invention adjusts the compressed air quantity of the compressor based on the variation trend of the liquid carrying condition of the compressor. Under the condition that the liquid carrying condition of the compressor has a worsening trend, the liquid carrying condition of the compressor is relieved in a compressed air volume reducing mode, the requirement for higher accuracy can be met, the misoperation condition is avoided, and the stable operation of the compressor and a compression system is ensured.
the operation control method according to the above technical solution of the present invention may further have the following additional technical features:
In the above technical solution, the step of obtaining an operating parameter of the compressor and calculating a variation of the operating parameter in a first time period specifically includes: acquiring the suction superheat degree of the compressor, and calculating the descending amount of the suction superheat degree in a first time length; and/or acquiring the exhaust superheat degree of the compressor, and calculating the descending amount of the exhaust superheat degree in the first time length; and/or obtaining the temperature of the liquid in the compressor and calculating the amount of liquid decline over the first period of time.
In this solution, the operating parameters of the compressor include, but are not limited to, the following operating parameters: the suction superheat of the compressor, the discharge superheat of the compressor, and the liquid temperature in the compressor. The operation parameters all represent the actual operation condition of the compressor, and whether the liquid carrying condition of the compressor has a deterioration trend can be accurately detected by detecting the operation parameters.
Specifically, when the variation trend of the liquid carrying phenomenon of the compressor is judged according to the suction superheat degree of the compressor, the suction superheat degree of the compressor at a first time length starting time node and the suction superheat degree of the compressor at a first time length ending time node can be respectively detected, and the variation of the suction superheat degree in a first time length is obtained through calculation.
Specifically, when the variation trend of the liquid carrying phenomenon of the compressor is judged according to the exhaust superheat degree of the compressor, the exhaust superheat degree of the compressor at a first time length starting time node and the exhaust superheat degree of a first time length ending time node can be respectively detected, and the variation of the exhaust superheat degree in a first time length is obtained through calculation.
Specifically, when the variation trend of the liquid carrying phenomenon of the compressor is judged according to the variation of the liquid in the compressor in the first time length, the temperature of the liquid in the compressor at the first time length starting time node and the first time length ending time node can be respectively detected, and the variation of the temperature of the liquid in the compressor in the first time length is obtained through calculation.
In any of the above technical solutions, the step of adjusting the compressed air amount of the compressor according to the variation of the operation parameter in the first time period specifically includes: the descending amount of the suction superheat degree in the first time length is larger than or equal to a first temperature threshold value, and the compressed air quantity of the compressor is reduced; and/or the descending amount of the exhaust superheat degree in the first time length is larger than or equal to a second temperature threshold value, and the compressed air quantity of the compressor is reduced; and/or the descending amount of the liquid in the compressor in the first time period is greater than or equal to the third temperature threshold value, and the compressed air amount of the compressor is reduced.
In the technical scheme, whether the liquid carrying condition of the compressor has a deterioration trend or not can be judged in different modes, and after the liquid carrying condition of the compressor is determined to have the deterioration trend, the deterioration trend is relieved in a mode of reducing the compressed air volume of the compressor, and then the stable work of the compressor is ensured.
The determination method includes, but is not limited to, the following determination methods: when the reduction amount of the suction superheat degree in the first time length is larger than or equal to a first temperature threshold value, the liquid carrying condition of the compressor has a deterioration trend; when the reduction amount of the exhaust superheat degree in the first time length is larger than or equal to a second temperature threshold value, the liquid carrying condition of the compressor has a deterioration trend; when the descending amount of the liquid in the compressor in the first time period is larger than or equal to the third temperature threshold value, the liquid carrying condition of the compressor has a worsening trend.
In any of the above technical solutions, the first time length is less than or equal to 300 seconds; and/or the first temperature threshold is less than or equal to 5 ℃; and/or the second temperature threshold is less than or equal to 5 ℃; and/or the third temperature threshold is less than or equal to 5 ℃.
In the technical scheme, the value ranges of the first time length, the first temperature threshold, the second temperature threshold and the third temperature threshold are further limited, so that the variation trend of the liquid carrying condition of the compressor is accurately judged, the compressed air quantity of the compressor is adjusted under the condition that the deterioration trend exists in the liquid carrying condition, and the stable operation of the compressor is ensured.
specifically, the first time length may be selected to be 100 seconds, 200 seconds, or 300 seconds; the first temperature threshold can be 1 ℃, 3 ℃, 5 ℃ and the like; the second temperature threshold can be 1 ℃, 3 ℃, 5 ℃ and the like; the third temperature threshold may be 1 deg.C, 3 deg.C, 5 deg.C, etc. The person skilled in the art can, in the light of the present invention, set itself up in connection with the actual situation.
In any of the above technical solutions, the step of reducing the compressed air amount of the compressor specifically includes: reducing the working frequency of the compressor; and/or reducing the operating load of the compressor; and/or reducing the opening of a regulating valve in a compression system in which the compressor is located.
In this embodiment, the compressed air amount of the compressor is reduced, including but not limited to the following ways: the operating frequency of the compressor is reduced, the operating load of the compressor is reduced, or the opening degree of a regulating valve in a compression system in which the compressor is located is reduced. The above mode can cause the circulation air quantity in the compression system to change, and then change the compressed air quantity of the compressor to alleviate the liquid carrying condition of the compressor and avoid the further deterioration of the liquid carrying condition of the compressor.
In any of the above technical solutions, before the step of calculating the variation of the operating parameter in the first time period, the method further includes: judging whether the operating parameters of the compressor meet the liquid carrying condition or not; executing the step of calculating the variation of the operation parameter in the first time period based on the condition that the operation parameter of the compressor meets the liquid carrying condition; and controlling the compressor to work at the current compressed air quantity based on the condition that the operating parameters of the compressor do not meet the liquid carrying condition.
In the technical scheme, before the deterioration trend of the liquid carrying condition of the compressor is judged, whether the operation parameters of the compressor meet the liquid carrying condition or not is judged firstly. When the operation parameters of the compressor meet the liquid carrying condition, calculating the variation of the operation parameters of the compressor within a first time period, and further judging whether the liquid carrying condition has a deterioration trend; when the operation parameters of the compressor do not meet the liquid carrying condition, the compressor can be stably operated, so that the compressed air quantity of the compressor does not need to be adjusted, and the compressor is controlled to work at the current compressed air quantity.
Specifically, when the operation parameter of the compressor is detected not to satisfy the liquid carrying condition, the stable operation of the compressor is indicated, the overall control flow can be simplified, and unnecessary calculation process and control process are avoided. When the compressor is determined to meet the liquid carrying condition, whether the liquid carrying condition has a deterioration trend or not is further detected, and then the compressed air quantity of the compressor is adjusted according to the actual condition, so that the stable work of the compressor is ensured. The operation control mode provided by the invention can be used for carrying out different controls based on different stages of the compressor, thereby realizing effective control on the compression system and ensuring the reliable operation of the compression system.
in any of the above technical solutions, the liquid carrying conditions are as follows: the suction superheat degree of the compressor is less than or equal to a first preset temperature, and the duration is greater than or equal to a second duration; and/or the exhaust superheat degree of the compressor is less than or equal to a second preset temperature, and the duration is greater than or equal to a second duration; and/or the amount of liquid in the compressor that falls during the second period of time is greater than or equal to a fourth temperature threshold.
In this embodiment, the method for determining whether the compressor has a liquid-carrying condition includes, but is not limited to, the following methods: the suction superheat degree of the compressor is less than or equal to a first preset temperature, and the duration is greater than or equal to a second duration; the exhaust superheat degree of the compressor is less than or equal to a second preset temperature, and the duration is greater than or equal to a second duration; and the descending amount of the liquid in the compressor in the second time period is greater than or equal to a fourth temperature threshold value. When the compressor has the liquid carrying condition, the suction superheat degree, the exhaust superheat degree and the temperature of liquid in the compressor all can be obviously changed, so that whether the liquid carrying condition exists in the compressor can be accurately judged by the mode.
In any of the above technical solutions, the first preset temperature is less than or equal to 5 ℃; and/or the second preset temperature is less than or equal to 5 ℃; and/or the second duration is less than or equal to 600 seconds.
In the technical scheme, the value ranges of the first preset temperature, the first preset temperature and the second time are further limited, so that whether the compressor carries liquid or not is accurately detected.
specifically, the first preset temperature may be 1 ℃, 3 ℃, 5 ℃, etc.; the second preset temperature can be 1 ℃, 3 ℃, 5 ℃ and the like; the second time period may be 100 seconds, 300 seconds, 600 seconds, etc. The person skilled in the art can, in the light of the present invention, set itself up in connection with the actual situation.
in any of the above technical solutions, after the step of adjusting the compressed air amount of the compressor according to the variation of the operation parameter in the first time period, the method further includes: controlling the compressor to operate at the adjusted compressed air amount for a third duration; the descending amount of the suction superheat degree of the compressor in the third time length is smaller than the first temperature threshold value, and the compressed air quantity of the compressor is recovered; and/or the descending amount of the exhaust superheat degree of the compressor in the third time length is smaller than a second temperature threshold value, and the compressed air quantity of the compressor is recovered; and/or the descending amount of the liquid in the compressor in the third time period is less than the third temperature threshold value, and the compressed air amount of the compressor is recovered.
In the technical scheme, after the compressed air quantity of the compressor is adjusted, the compressor is controlled to operate for a third time length according to the adjusted compressed air quantity, and the operation parameters of the compressor are obtained again; determining whether the liquid carrying condition exists according to the operation parameters of the compressor, and judging whether the liquid carrying condition of the compressor has a deterioration trend according to the change condition of the operation parameters; and finally, adjusting the compressed air quantity of the compressor according to the actual condition of the compressor after the compressor is adjusted to operate for the third time. That is to say, the operation control method provided by the invention further rechecks the operation state of the compressor after adjusting the compressed air quantity of the compressor, and performs different controls on the compressor at different stages, thereby realizing the whole-process control on the compressor and ensuring the stable operation of the compressor. Wherein the third duration can be set according to the actual liquid-carrying condition.
specifically, when the compressor does not have a liquid carrying condition after the compressor operates for the third time period by adjusting the compressed air quantity, the compressed air quantity of the compressor can be increased, so that the compressor operates at the compressed air quantity before adjustment; when the compressor runs for a third time period after the compressed air quantity is adjusted, the liquid carrying condition exists, but the liquid carrying condition does not have a deterioration trend, the compressor is controlled to run at the adjusted compressed air quantity; and when the liquid carrying condition exists after the compressor operates for the third time period by adjusting the compressed air quantity, and the liquid carrying condition still has a deterioration trend, continuously reducing the compressed air quantity of the compressor until the compressor can stably operate.
A second aspect of the present invention provides an operation control system comprising: a memory configured to be adapted to store a computer program; a processor configured to be adapted to execute a computer program to implement the operation control method according to any one of the above-described technical solutions.
The operation control system provided by the invention comprises a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the operation control method of any technical scheme can be realized. Therefore, the overall advantageous effects of the above operation control method are obtained.
A third aspect of the present invention provides a computer-readable storage medium, on which a computer program is stored, the computer program, when being executed by a processor, implementing the operation control method according to any one of the above-mentioned technical solutions.
the computer-readable storage medium of the present invention stores thereon a computer program, and when the computer program is executed by a processor, the operation control method according to any of the above-mentioned technical solutions can be implemented. Therefore, the overall advantageous effects of the above operation control method are obtained.
A fourth aspect of the present invention provides a compression system comprising: a compressor; and the operation control system is used for controlling the work of the compressor.
The compression system provided by the invention comprises a compressor and the operation control system of the technical scheme, and the operation control system can control the compressor to work. Therefore, the overall advantageous effects of the above operation control method are obtained.
In the above technical solution, the compression system further includes: the slide valve is connected with the compressor and used for adjusting the compressed air quantity of the compressor; and/or the regulating valve is connected with the compressor and used for regulating the compressed air quantity of the compressor.
In this solution, the compression system also comprises a slide valve and/or a regulating valve. The slide valve and the regulating valve can be connected with the compressor, and the air flow in the compression system can be controlled by the operation control system, so that the compressed air flow of the compressor is changed, and the liquid carrying condition of the compressor is relieved.
a fifth aspect of the present invention provides an air conditioning system comprising: the compression system of the above technical scheme.
the air conditioning system provided by the invention comprises the compression system in the technical scheme. Thus, the overall benefits of the compression system described above are achieved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
the above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
Fig. 1 shows a schematic flow chart of an operation control method of a first embodiment of the present invention;
FIG. 2 is a schematic flow chart showing an operation control method of a second embodiment of the present invention;
FIG. 3 is a schematic flow chart showing an operation control method of a third embodiment of the present invention;
FIG. 4 shows a schematic block diagram of an operation control system of one embodiment of the present invention;
Fig. 5 shows a schematic flow chart of an operation control method according to an embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as specifically described herein, and thus the scope of the present invention is not limited by the specific embodiments disclosed below.
An operation control method, an operation control system, a computer-readable storage medium, a compression system, and an air conditioning system according to some embodiments of the present invention are described below with reference to fig. 1 to 5.
The first embodiment is as follows:
Fig. 1 is a schematic flowchart showing an operation control method according to a first embodiment of the present invention, as shown in fig. 1, including:
S102, obtaining the operation parameters of the compressor, and calculating the variation of the operation parameters in a first time period;
and S104, adjusting the compressed air quantity of the compressor according to the variable quantity of the operation parameter in the first time length.
In the embodiment, firstly, the operation parameters of the compressor are obtained, and the change condition of the operation parameters of the compressor in the first time period is calculated; and then judging whether the liquid carrying condition of the compressor has a deterioration trend or not according to the variation of the operation parameter in the first time period. When the liquid carrying condition has a deterioration trend, the compressed air quantity of the compressor is reduced, so that the liquid carrying condition of the compressor is relieved to a certain extent, and the stable operation of the compressor is ensured; and when the liquid carrying condition does not have a deterioration trend, controlling the compressor to work at the current compressed air quantity.
The operating parameters of the compressor include, but are not limited to, the following: the suction superheat of the compressor, the discharge superheat of the compressor, and the temperature of the liquid in the compressor. The operation parameters all represent the actual operation condition of the compressor, and whether the liquid carrying condition of the compressor has a deterioration trend can be accurately detected by detecting the operation parameters.
The method for judging whether the liquid carrying condition of the press has a deterioration trend includes, but is not limited to, the following judging methods: when the reduction amount of the suction superheat degree in the first time length is larger than or equal to a first temperature threshold value, determining that the liquid carrying condition of the compressor has a deterioration trend; when the reduction amount of the exhaust superheat degree in the first time length is larger than or equal to a second temperature threshold value, determining that the liquid carrying condition of the compressor has a deterioration trend; and when the descending amount of the liquid in the compressor in the first time period is larger than or equal to the third temperature threshold value, determining that the liquid carrying condition of the compressor has a deterioration trend.
the compressed air quantity of the compressor is reduced by the following regulation modes: the operating frequency of the compressor is reduced, the operating load of the compressor is reduced, or the opening degree of a regulating valve in a compression system in which the compressor is located is reduced. The above mode can cause the circulation air quantity in the compression system to change, and then change the compressed air quantity of the compressor to alleviate the liquid carrying condition of the compressor and avoid the further deterioration of the liquid carrying condition of the compressor.
Specifically, when the compressed air quantity of the compressor is reduced by reducing the frequency of the compressor, the action amplitude Δ N is T4 × N × C%; when the compressed air quantity of the compressor is reduced by adopting a mode of reducing the running load of the compressor, the action amplitude or delta N is T2N C%; when the compressed air quantity of the compressor is reduced by reducing the opening degree of the regulating valve, the action amplitude Delta N is Delta T1N C%. Correspondingly, the current frequency P or the current slide valve H or the current control valve opening D, or a combination of these three parameters (P × H or P × D), may also be used.
In the above calculation disclosure, N is the current adjustable load of the compressor, C% is the adjustment coefficient, T1 is the first preset temperature, T2 is the second preset temperature, Δ T4 is the fourth temperature threshold, and the value of C% is between 0% and 50%.
Note that, in this embodiment, the first time length is 300 seconds or less; and/or the first temperature threshold is less than or equal to 5 ℃; the second temperature threshold is less than or equal to 5 ℃; the third temperature threshold is less than or equal to 5 ℃. The specific values of the above parameters, which can be set by those skilled in the art in light of the present disclosure in combination with practical situations, are within the scope of the present disclosure.
The operation control mode provided by the invention takes the variation trend of the liquid carrying condition as the judgment basis for regulating the compressed air quantity of the compressor, can avoid the transient state caused by the fluctuation of the compression system, can accurately judge the liquid carrying condition of the compressor, can meet the requirement of higher accuracy, avoids the misoperation on the compressor, and ensures that the compressor and the whole compression system run more stably; the change trend of the liquid carrying condition of the compressor can be judged in different judging modes, so that the applicability is stronger; in the process of adjusting the compressed air quantity of the compressor, the adjustment is carried out according to the specific degree of the liquid carrying condition according to the preset adjustment formula, and the adjustment amplitude can be matched with the actual running state.
Example two:
Fig. 2 is a schematic flow chart showing an operation control method according to a second embodiment of the present invention, as shown in fig. 2, including:
S202, obtaining the operation parameters of the compressor;
S204, judging whether the operation parameters of the compressor meet the liquid carrying condition, if so, executing S206, and if not, executing S208;
S206, calculating the variation of the operation parameters in the first time length;
S208, controlling the compressor to work at the current compressed air quantity;
And S210, adjusting the compressed air quantity of the compressor according to the variable quantity of the operation parameter in the first time length.
In this embodiment, after the operation parameters of the compressor are obtained, it is first determined whether the compressor has a liquid-carrying condition. If the compressor does not have the liquid carrying condition, the compressor can be stably operated, and the compressor is controlled to operate at the current compressed air quantity; if the compressor has liquid-carrying condition, it needs to further judge whether the liquid-carrying condition of the compressor has a deterioration trend (the judging method is the same as the first embodiment). Through the calculation of the variation of the operation parameter in the first time period, whether the liquid carrying condition of the compressor has a deterioration trend can be accurately determined. When the compressor has a liquid carrying condition and the liquid carrying condition has a deterioration trend, the compressed air quantity of the compressor is reduced to relieve the liquid carrying condition and ensure the normal operation of the compressor; and controlling the compressor to operate at the current compressed air quantity under the condition that the compressor has the liquid carrying condition but the liquid carrying condition of the compressor does not have the deterioration trend.
the method for determining whether the compressor has a liquid-carrying condition includes, but is not limited to, the following determination methods: the suction superheat degree of the compressor is less than or equal to a first preset temperature, and the duration is greater than or equal to a second duration; the exhaust superheat degree of the compressor is less than or equal to a second preset temperature, and the duration is greater than or equal to a second duration; and the descending amount of the liquid in the compressor in the second time period is greater than or equal to a fourth temperature threshold value. When the compressor has the liquid carrying condition, the suction superheat degree, the exhaust superheat degree and the temperature of liquid in the compressor all can be obviously changed, so that whether the liquid carrying condition exists in the compressor can be accurately judged by the mode.
notably, the first predetermined temperature is less than or equal to 5 ℃; the second preset temperature is less than or equal to 5 ℃; the second time period is less than or equal to 600 seconds. The specific values of the above parameters, which can be set by those skilled in the art in light of the present disclosure in combination with practical situations, are within the scope of the present disclosure.
Example three:
Fig. 3 is a schematic flowchart showing an operation control method of a third embodiment of the present invention, as shown in fig. 3, including:
S302, obtaining the operation parameters of the compressor;
S304, judging whether the operation parameters of the compressor meet the liquid carrying condition, if so, executing S306, and if not, executing S308;
S306, calculating the variation of the operation parameters in the first time length;
s308, controlling the compressor to work at the current compressed air quantity;
S310, adjusting the compressed air quantity of the compressor according to the variable quantity of the operation parameter in the first time length;
s312, controlling the compressor to operate for a third time length according to the adjusted compressed air quantity;
S314, calculating the variation of the operation parameter in the third time length;
And S316, adjusting the compressed air quantity of the compressor according to the variable quantity of the operation parameter in the third time period.
In this embodiment, after the amount of compressed gas of the compressor has been adjusted, the compressor is controlled to operate for a third length of time at the adjusted amount of compressed gas; after the compressor is operated for a third period of time at the adjusted compressed air volume, the liquid-carrying condition is generally alleviated. Therefore, the operation parameters of the compressor are obtained again, whether the liquid carrying condition exists or not is determined according to the operation parameters of the compressor, and whether the liquid carrying condition of the compressor has a deterioration trend or not is judged according to the change condition of the operation parameters; and finally, adjusting the compressed air quantity of the compressor according to the actual condition of the compressor after the compressor is adjusted to operate for the third time.
Specifically, when the compressor does not have a liquid carrying condition after the compressor operates for the third time period by adjusting the compressed air quantity, the compressed air quantity of the compressor can be increased, so that the compressor operates at the compressed air quantity before adjustment; when the compressor runs for a third time period after the compressed air quantity is adjusted, the liquid carrying condition exists, but the liquid carrying condition does not have a deterioration trend, the compressor is controlled to run at the adjusted compressed air quantity; and when the liquid carrying condition exists after the compressor operates for the third time period by adjusting the compressed air quantity, and the liquid carrying condition still has a deterioration trend, continuously reducing the compressed air quantity of the compressor until the compressor can stably operate.
that is to say, the operation control method provided by the invention further rechecks the operation state of the compressor after adjusting the compressed air quantity of the compressor, and performs different controls on the compressor at different stages, thereby realizing the whole-process control on the compressor and ensuring the stable operation of the compressor. Wherein the third duration can be set according to the actual liquid-carrying condition.
example four:
fig. 4 shows a schematic block diagram of an operation control system 400 according to a fourth embodiment of the present invention, which includes a memory 402 and a processor 404, as shown in fig. 4.
The memory 402 stores a computer program, and the processor 404 executes the computer program to implement the operation control method according to any of the above embodiments. Therefore, the overall advantageous effects of the above operation control method are obtained.
Example five:
A fifth embodiment of the present invention proposes a computer-readable storage medium on which a computer program is stored, the computer program, when executed by a processor, implementing the operation control method according to any one of the above embodiments. Therefore, the overall advantageous effects of the above operation control method are obtained.
Example six:
A sixth embodiment of the present invention provides a compression system, which includes a compressor and the operation control system according to the above technical solution, wherein the operation control system can control the operation of the compressor. Therefore, the overall advantageous effects of the operation control system of the above embodiment are obtained.
Further, the compression system also includes a slide valve and a regulating valve. The slide valve and the regulating valve can be connected with the compressor, and the air flow in the compression system can be controlled by the operation control system, so that the compressed air flow of the compressor is changed, and the liquid carrying condition of the compressor is relieved.
Example seven:
A seventh embodiment of the present invention provides an air conditioning system including: such as the compression system of the above embodiment. Thus, the overall benefits of the compression system described above are achieved.
The specific embodiment is as follows:
The invention aims to solve the problem of oil leakage caused by liquid carried in a compression system in the starting or running process and provide a simple, quick, reliable and effective energy-regulating control method.
The control logic of the technical scheme of the invention is shown in figure 5:
and in the running process of the compression system, continuously detecting the running state of the compression system and judging whether the compressor carries liquid or not. The condition 1 for determining compression and liquid carrying includes, but is not limited to, the following liquid carrying conditions:
The degree of superheat of the air suction is less than or equal to a first preset temperature T1 (0-5 ℃), and the duration time is more than or equal to a second time duration 2 (0-600S); the exhaust superheat degree is less than or equal to T2, the temperature is a second preset temperature T2 (0-9 ℃), and the duration time is more than or equal to a second time duration 2 (0-600S); during the second time period 2, the temperature of the oil in the compressor drops by a fourth temperature threshold Δ T4(0 ℃ C. to 5 ℃ C.).
if the compressor meets one of the liquid carrying conditions, judging that the liquid carrying exists in the compressor; otherwise, judging that the compressor does not have liquid.
the judgment condition 2 for the tendency of change with liquid includes, but is not limited to, the following deterioration conditions: in the first time period 1(0S to 300S), the reduction of the superheat degree of inspiration is equal to or more than delta T1 of a first temperature threshold (0 ℃ to 5 ℃); in the first time period 1(0S to 300S), the superheat degree of the exhaust gas decreases more than or equal to a second temperature threshold (0 ℃ to 5 ℃) of delta T2; during the first time period 1(0S to 300S), the temperature of the oil in the compressor decreases by Δ T3 a third temperature threshold (0 ℃ to 5 ℃).
If the compressor meets one of the deterioration conditions, judging that the compressor has a deterioration trend; otherwise, the compressor can maintain the current compressed air quantity.
the method can reduce the change of circulating gas quantity caused by frequency change, slide valve change or air inlet regulating valve, and the like, and uses the existing adjustable size and liquid carrying degree to process the action amplitude, wherein the variable period is the third time length 3(0S to 300S) each time.
The loop judgment execution action is as follows: 1. reducing the frequency, and enabling the action amplitude delta N to be T4N C%; 2. unloading the slide valve, wherein the action amplitude delta N is T2N C%; 3. the air inlet regulating valve is closed, and the action amplitude delta N is delta T1N C%. Wherein, N is the current adjustable load, and the current frequency P or the current slide valve H or the current adjusting valve opening D can be correspondingly adopted, or the combination of the three parameters (P H or P D) can also be adopted; c% is an adjusting coefficient (0-50%), T1 is a first preset temperature, T2 is a second preset temperature, Delta T4 is a fourth temperature threshold, and the value of C% is 0-50%.
The scheme can set different judgment conditions and action parameters at different stages of starting and running of the compressor, and achieves the aim of controllable and reliable running. The scheme can be used together with the regulation and control of the electronic expansion valve or be used independently under the condition that the electronic expansion valve is invalid or has no regulation.
In the following, the operation control method proposed by the present invention is explained by a specific embodiment:
Firstly, judging the liquid-carrying state of the current compression system, such as the exhaust superheat degree of a compressor is less than 5 ℃, the exhaust superheat degree lasts for 90S (condition 1), and the exhaust superheat degree continuously drops to be more than 0.3 ℃ within 60S (condition 2); then, the compressor is turned down one step (e.g., down 10Hz or down one step slide valve or closing 20% suction valve) and the compressor is maintained in this turned-down state for 120S (third time period 3). And after 120S, judging the liquid carrying condition of the compression system, if the compression system is normal, recovering to the normal energy regulation, and if the exhaust superheat degree is not reduced or is reduced by less than 0.3 ℃, maintaining the energy regulation.
The operation control method provided by the invention monitors the liquid carrying condition according to the operation state of the compression system, adjusts the adjustable state of the compressor in time, and ensures that the compression system can prevent oil leakage caused by liquid carrying under severe working conditions.
The operation control method provided by the invention is mainly applied to a screw unit of a vapor compression refrigeration cycle. Reducing the liquid carrying amount by quickly reducing the energy-adjusting load, quickly leaving the liquid carrying state, and recovering normal energy adjustment after the system rebalance state is improved and stabilized in a third Time period of Time 3; the Time limit of the first Time length Time1 and the second Time length Time2 can avoid the transient state caused by the fluctuation of the compression system, and can accurately judge the liquid carrying condition.
in the description of the present invention, the terms "plurality" or "a plurality" refer to two or more, and unless otherwise specifically limited, the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
in the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (14)
1. An operation control method characterized by comprising:
acquiring an operating parameter of a compressor, and calculating the variable quantity of the operating parameter in a first time period;
And adjusting the compressed air quantity of the compressor according to the variable quantity of the operation parameter in the first time length.
2. The operation control method according to claim 1, wherein the step of obtaining the operation parameter of the compressor and calculating the variation of the operation parameter in the first time period specifically comprises:
Acquiring the suction superheat degree of the compressor, and calculating the descending amount of the suction superheat degree in the first time length; and/or
Acquiring the exhaust superheat degree of the compressor, and calculating the descending amount of the exhaust superheat degree in the first time length; and/or
And acquiring the temperature of the liquid in the compressor, and calculating the descending amount of the liquid in the first time period.
3. the operation control method according to claim 2, wherein the step of adjusting the amount of compressed air of the compressor according to the variation of the operation parameter in the first time period specifically comprises:
The descending amount of the suction superheat degree in the first time length is larger than or equal to a first temperature threshold value, and the compressed air quantity of the compressor is reduced; and/or
The descending amount of the exhaust superheat degree in the first time length is larger than or equal to a second temperature threshold value, and the compressed air quantity of the compressor is reduced; and/or
and the descending amount of the liquid in the compressor in the first time length is more than or equal to a third temperature threshold value, and the compressed air amount of the compressor is reduced.
4. The operation control method according to claim 3,
The first time length is less than or equal to 300 seconds; and/or
The first temperature threshold is less than or equal to 5 ℃; and/or
The second temperature threshold is less than or equal to 5 ℃; and/or
The third temperature threshold is less than or equal to 5 ℃.
5. The operation control method according to claim 3, wherein the step of reducing the amount of the compressed air of the compressor specifically includes:
Reducing the operating frequency of the compressor; and/or
reducing an operating load of the compressor; and/or
And reducing the opening degree of a regulating valve in a compression system where the compressor is located.
6. The operation control method according to any one of claims 2 to 5, characterized in that the step of calculating the amount of change in the operation parameter over the first period of time further comprises:
Judging whether the operating parameters of the compressor meet the liquid carrying condition or not;
Executing the step of calculating the variation of the operation parameter in a first time period based on the condition that the operation parameter of the compressor meets the liquid carrying condition;
and controlling the compressor to work at the current compressed air quantity based on the condition that the operating parameters of the compressor do not meet the liquid carrying condition.
7. The operation control method according to claim 6, wherein the fluid-carrying condition is:
The suction superheat degree of the compressor is less than or equal to a first preset temperature, and the duration is greater than or equal to a second duration; and/or
The discharge superheat degree of the compressor is less than or equal to a second preset temperature, and the duration is greater than or equal to the second duration; and/or
And the descending amount of the liquid in the compressor in the second time period is greater than or equal to a fourth temperature threshold value.
8. The operation control method according to claim 7,
the first preset temperature is less than or equal to 5 ℃; and/or
The second preset temperature is less than or equal to 5 ℃; and/or
the second time length is less than or equal to 600 seconds.
9. The operation control method according to any one of claims 3 to 5, characterized in that, after the step of adjusting the amount of the compressed air of the compressor in accordance with the amount of change in the operation parameter in the first period, further comprising:
controlling the compressor to operate at the adjusted compressed air amount for a third duration;
The descending amount of the suction superheat degree of the compressor in the third time length is smaller than the first temperature threshold value, and the compressed air quantity of the compressor is recovered; and/or
The descending amount of the discharge superheat degree of the compressor in the third time length is smaller than the second temperature threshold value, and the compressed air quantity of the compressor is recovered; and/or
and the descending amount of the liquid in the compressor in the third time period is smaller than the third temperature threshold value, and the compressed air amount of the compressor is recovered.
10. an operation control system characterized by comprising:
a memory configured to be adapted to store a computer program;
A processor configured to be adapted to execute the computer program to implement the operation control method according to any one of claims 1 to 9.
11. a computer-readable storage medium on which a computer program is stored, the computer program, when being executed by a processor, implementing an operation control method according to any one of claims 1 to 9.
12. a compression system, comprising:
A compressor; and
The operation control system of claim 10, said operation control system for controlling operation of said compressor.
13. The compression system of claim 12, further comprising:
The slide valve is connected with the compressor and used for adjusting the compressed air quantity of the compressor; and/or
and the regulating valve is connected with the compressor and used for regulating the compressed air quantity of the compressor.
14. An air conditioning system, comprising: a compression system as claimed in claim 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910886103.5A CN110553441B (en) | 2019-09-19 | 2019-09-19 | Operation control method and system, readable storage medium, compression and air conditioning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910886103.5A CN110553441B (en) | 2019-09-19 | 2019-09-19 | Operation control method and system, readable storage medium, compression and air conditioning system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110553441A true CN110553441A (en) | 2019-12-10 |
| CN110553441B CN110553441B (en) | 2021-08-20 |
Family
ID=68740893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910886103.5A Active CN110553441B (en) | 2019-09-19 | 2019-09-19 | Operation control method and system, readable storage medium, compression and air conditioning system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110553441B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114405263A (en) * | 2021-12-24 | 2022-04-29 | 宁波鲍斯能源装备股份有限公司 | Protection device and catalysis oil-free compression system of catalysis deoiling equipment |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014190658A (en) * | 2013-03-28 | 2014-10-06 | Panasonic Corp | Refrigerator |
| CN107421176A (en) * | 2017-06-28 | 2017-12-01 | 珠海格力电器股份有限公司 | The control method and heat pump of electric expansion valve |
| CN107806715A (en) * | 2017-10-25 | 2018-03-16 | 珠海格力电器股份有限公司 | Water chiller and its throttling regulation and control method |
| US10184705B2 (en) * | 2013-10-18 | 2019-01-22 | Carel Industries S.p.A. | Actuation method of a refrigerating machine provided with an economizer apparatus |
| CN109506315A (en) * | 2018-11-29 | 2019-03-22 | 珠海格力电器股份有限公司 | A kind of air conditioner and the control method for preventing compressor from running with liquid |
| CN109813009A (en) * | 2018-12-20 | 2019-05-28 | 珠海格力电器股份有限公司 | Air-conditioning system and its method for controlling oil return |
| CN110006138A (en) * | 2019-03-01 | 2019-07-12 | 青岛海尔空调电子有限公司 | Prevent the control method and control system of the compressor liquid hammer of air conditioner |
-
2019
- 2019-09-19 CN CN201910886103.5A patent/CN110553441B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014190658A (en) * | 2013-03-28 | 2014-10-06 | Panasonic Corp | Refrigerator |
| US10184705B2 (en) * | 2013-10-18 | 2019-01-22 | Carel Industries S.p.A. | Actuation method of a refrigerating machine provided with an economizer apparatus |
| CN107421176A (en) * | 2017-06-28 | 2017-12-01 | 珠海格力电器股份有限公司 | The control method and heat pump of electric expansion valve |
| CN107806715A (en) * | 2017-10-25 | 2018-03-16 | 珠海格力电器股份有限公司 | Water chiller and its throttling regulation and control method |
| CN109506315A (en) * | 2018-11-29 | 2019-03-22 | 珠海格力电器股份有限公司 | A kind of air conditioner and the control method for preventing compressor from running with liquid |
| CN109813009A (en) * | 2018-12-20 | 2019-05-28 | 珠海格力电器股份有限公司 | Air-conditioning system and its method for controlling oil return |
| CN110006138A (en) * | 2019-03-01 | 2019-07-12 | 青岛海尔空调电子有限公司 | Prevent the control method and control system of the compressor liquid hammer of air conditioner |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114405263A (en) * | 2021-12-24 | 2022-04-29 | 宁波鲍斯能源装备股份有限公司 | Protection device and catalysis oil-free compression system of catalysis deoiling equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110553441B (en) | 2021-08-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7895852B2 (en) | System and method for controlling an economizer circuit | |
| CN109855336B (en) | Control method of refrigerating system | |
| EP2587193A2 (en) | Air conditioner | |
| CN111895630B (en) | Air conditioner operation control method, air conditioner and storage medium | |
| US9829242B2 (en) | Refrigeration device | |
| CN110529991A (en) | The control method and system of air conditioner, air conditioner and computer readable storage medium | |
| CN108885028B (en) | Refrigeration cycle device | |
| CN110553441B (en) | Operation control method and system, readable storage medium, compression and air conditioning system | |
| JP4575184B2 (en) | Air conditioner | |
| CN113720030B (en) | Air conditioner, control method, control device, and computer-readable storage medium | |
| CN111981719A (en) | Refrigerating unit compression refrigeration cycle control method and device and refrigerating unit | |
| CN113432283B (en) | Enthalpy-increasing air conditioner control method and device, enthalpy-increasing air conditioner and computer storage medium | |
| US10823474B2 (en) | Perturbation of expansion valve in vapor compression system | |
| CN114279118B (en) | Compressor oil return control method, device and equipment, water chilling unit and air conditioner | |
| CN113405289B (en) | Heat pump exhaust temperature adjusting method | |
| CN112665222B (en) | Refrigeration system and oil supply control method, device and controller thereof | |
| US11906219B2 (en) | Flash tank-based control of refrigerant injection into a compressor | |
| EP3722700B1 (en) | Refrigeration cycle device | |
| CN113720058B (en) | Oil return control device and method of air conditioning system and air conditioning system | |
| CN113803859A (en) | Air conditioner, control method, control device, and computer-readable storage medium | |
| CN113251607B (en) | Air conditioner refrigeration control method and device, air conditioner and computer storage medium | |
| CN116772381A (en) | Method and device for adjusting opening of electronic expansion valve of air conditioner | |
| CN114508808A (en) | Magnetic suspension variable frequency water chilling unit | |
| CN117029304A (en) | Air conditioner heat pump system and control method thereof | |
| CN113446766A (en) | Control method of water chilling unit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |