CN112082293A - Throttle valve control method and device, compressed steam circulation system and air conditioner - Google Patents
Throttle valve control method and device, compressed steam circulation system and air conditioner Download PDFInfo
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- CN112082293A CN112082293A CN202010938933.0A CN202010938933A CN112082293A CN 112082293 A CN112082293 A CN 112082293A CN 202010938933 A CN202010938933 A CN 202010938933A CN 112082293 A CN112082293 A CN 112082293A
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- 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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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Abstract
The application relates to a throttle valve control method, a throttle valve control device, a compressed steam circulation system and an air conditioner, wherein the method comprises the following steps: collecting real-time operation data of the unit; acquiring a reference device level value under a corresponding working condition from a preset database according to the real-time operation data; judging whether the real-time level value of the reference device in the real-time operation data is matched with the level value of the reference device; if so, controlling the throttle valve to keep the current opening unchanged; if not, the opening of the throttle valve is adjusted according to the liquid level value of the reference device. By collecting the operation data of the unit in real time, the throttle valve is controlled to adjust the opening only when the real-time level value of the reference device in the unit is not matched with the level value of the reference device under the corresponding working condition in the database, so that the influence on the stability of the operation parameters of the unit caused by frequent opening and closing of the throttle valve is avoided, the superheat degree control is effectively realized, and the overall performance of the unit is improved.
Description
Technical Field
The application relates to the technical field of electronic equipment control, in particular to a throttle valve control method and device, a compressed steam circulation system and an air conditioner.
Background
The throttle valve is one of the important components of the compression steam circulation system, plays the roles of throttling and regulating the liquid supply amount, and plays an important role in the unit performance of the compression steam circulation system. The throttle valve is controlled by taking the exhaust superheat degree and the suction superheat degree as main control signals and using a PID (proportional Integral derivative) algorithm to realize the throttle valve control. When the actual suction superheat degree is larger than the superheat degree target value, the opening degree of the electronic expansion valve is increased; when the actual suction superheat degree is smaller than the superheat degree target value, the opening degree of the electronic expansion valve is reduced; when the actual suction superheat is equal to the target superheat value, the opening degree of the electronic expansion valve is unchanged.
The traditional throttle valve control method takes exhaust superheat and suction superheat as main control signals, and because the control signal range is narrow, the variable is small in the adjustable range, and the control precision is not high enough, the throttle valve is controlled to be opened or closed frequently, and the throttle valve is frequently subjected to overshoot. By adopting the method to control the opening and closing of the throttle valve, the unit is easy to have overhigh suction superheat degree and overlow oscillation in the actual use process, so that the follow performance of the throttle valve and the system is poor, superheat degree control cannot be effectively realized, and the overall performance of the unit is influenced.
Disclosure of Invention
On the basis, the throttle valve control method, the throttle valve control device, the compressed steam circulation system and the air conditioner are needed to solve the problem that the overall performance of the unit is affected because the traditional throttle valve control method cannot effectively realize superheat degree control, and the effects of effectively realizing superheat degree control and improving the overall performance of the unit can be achieved.
A throttle valve control method comprising:
collecting real-time operation data of the unit;
acquiring a reference device liquid level value under a corresponding working condition from a preset database according to the real-time operation data;
judging whether the real-time level value of a reference device in the real-time operation data is matched with the level value of the reference device;
if so, controlling the throttle valve to keep the current opening unchanged;
if not, the opening of the throttle valve is adjusted according to the liquid level value of the reference device.
In one embodiment, the reference device is a condenser, an evaporator, a flash tank, or an economizer.
In one embodiment, the reference device is a condenser, and the real-time operation data comprises the power, the frequency, the guide vane opening, the evaporation pressure, the evaporation temperature, the condensation pressure, the condensation temperature, the freezing inlet and outlet water temperature, the cooling inlet and outlet water temperature and the condenser liquid level value of the unit.
In one embodiment, the determining whether the real-time level value of the reference device in the real-time operating data matches the level value of the reference device includes:
calculating the difference value between the real-time liquid level value of the reference device and the liquid level value of the reference device;
and if the difference value is less than or equal to a preset reference device liquid level deviation value, matching the real-time liquid level value of the reference device with the liquid level value of the reference device.
In one embodiment, the adjusting the opening of the throttle valve according to the reference device liquid level value comprises:
determining the target opening degree of the throttle valve according to the liquid level value of the reference device;
and adjusting the opening of the throttle valve according to the current opening and the target opening of the throttle valve.
In one embodiment, the database stores operation data corresponding to all operation conditions of the organic group.
In one embodiment, the throttle valve is arranged in a liquid supply pipeline of the unit.
A throttle valve control apparatus comprising:
the data acquisition module is used for acquiring real-time operation data of the unit;
the data processing module is used for acquiring the liquid level value of the reference device under the corresponding working condition from a preset database according to the real-time operation data;
the opening control module is used for judging whether the real-time level value of the reference device in the real-time operation data is matched with the level value of the reference device; if so, controlling the throttle valve to keep the current opening unchanged; if not, the opening of the throttle valve is adjusted according to the liquid level value of the reference device.
A compression steam circulation system comprises a unit, a throttle valve and a controller, wherein the throttle valve is arranged on a liquid supply pipeline of the unit, the controller is connected with the throttle valve, and the controller performs throttle control according to the method.
In one embodiment, the unit is a water chiller unit.
In one embodiment, the throttle valve is an electronic expansion valve.
An air conditioner comprises the compression steam circulation system.
The throttle valve control method, the throttle valve control device, the compressed steam circulation system and the air conditioner are realized by acquiring real-time operation data of the unit; and acquiring the liquid level value of the reference device under the corresponding working condition from a preset database according to the real-time operation data. If the real-time liquid level value of the reference device is not matched with the liquid level value of the reference device under the corresponding working condition in the database, the difference value between the real-time liquid level value of the reference device in the unit and the liquid level value of the reference device obtained by matching is out of the allowable deviation range, and the opening of the throttle valve is adjusted according to the liquid level value of the reference device under the corresponding working condition; and when the real-time level value of the reference device in the real-time operation data is matched with the level value of the reference device under the corresponding working condition in the database, keeping the current opening of the throttle valve unchanged. By collecting the operation data of the unit in real time, the throttle valve is controlled to adjust the opening only when the real-time level value of the reference device in the unit is not matched with the level value of the reference device under the corresponding working condition in the database, so that the influence on the stability of the operation parameters of the unit caused by frequent opening and closing of the throttle valve is avoided, the superheat degree control is effectively realized, and the overall performance of the unit is improved.
Drawings
FIG. 1 is a flow chart of a throttle control method in one embodiment;
FIG. 2 is a flowchart illustrating an embodiment of determining whether a real-time level value of a reference device in real-time operating data matches a reference device level value;
FIG. 3 is a flow chart illustrating the adjustment of the throttle opening based on a reference device level value according to an embodiment;
FIG. 4 is a block diagram of a throttle control apparatus according to an embodiment;
FIG. 5 is a schematic diagram of the control principle of the throttle valve in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In one embodiment, a throttle control method, as shown in FIG. 1, includes:
step S110: and acquiring real-time operation data of the unit.
Wherein the units may be chiller units. The specific structure of the unit is not unique, and the collected real-time operation data can be different according to different structures of the unit. The unit can include devices such as compressor, condenser, evaporimeter, flash tank and economic ware, and each device passes through the feed pipe way in the unit and communicates. In this embodiment, the throttle valve is disposed in the liquid supply line of the unit, and the type of the throttle valve is not unique, and may be an electronic expansion valve or other valve devices. Specifically, the controller can be connected with corresponding devices in the unit to acquire operation data, or a sensor is arranged on the device of the unit, and the operation data such as temperature, pressure and the like are collected by the sensor and fed back to the controller. The real-time operation data can comprise the power, the frequency, the guide vane opening degree, the evaporation pressure, the evaporation temperature, the condensation pressure, the condensation temperature, the freezing inlet and outlet water temperature, the cooling inlet and outlet water temperature, the condenser liquid level value, the throttle valve opening degree and the like of the water chilling unit. The controller can acquire data in real time according to the set action period to obtain the running data of the water cooling unit, and the running data is used for carrying out comparative analysis and throttle valve adjustment according to the acquired data in each action period.
Step S120: and acquiring the liquid level value of the reference device under the corresponding working condition from a preset database according to the real-time operation data.
In this embodiment, the database stores operation data corresponding to all operation conditions of the organic group. And the operation data stored in the database represents theoretical parameters of each device when the unit normally operates under different working conditions. Specifically, the database stores unit power, frequency, guide vane opening, evaporation pressure, evaporation temperature, condensation pressure, condensation temperature, freezing inlet and outlet water temperature, cooling inlet and outlet water temperature and corresponding condenser liquid level values corresponding to all operation conditions of the water chilling unit, and each data in the database can be summarized by the unit through multiple test analysis.
A certain device in the unit can be used as a reference device, the current working condition of the unit can be determined according to the collected real-time operation data, and the liquid level value of the reference device under the current working condition is searched from the database and is used for being compared with the real-time liquid level value of the actually collected reference device. The particular type of reference device chosen is not exclusive and the reference device may be a condenser, an evaporator, a flash tank, or an economizer. Taking the example that the reference device selects the condenser, the real-time operation data includes the power, frequency, guide vane opening, evaporation pressure, evaporation temperature, condensation pressure, condensation temperature, freezing inlet and outlet water temperature, cooling inlet and outlet water temperature and condenser liquid level value of the unit. For the convenience of understanding, the following explanation is given by taking the example of selecting a condenser as a reference device, and comparing the collected condenser level value with the condenser level value under the corresponding working condition in the database to control the opening of the throttle valve.
Step S130: and judging whether the real-time level value of the reference device in the real-time operation data is matched with the level value of the reference device.
Specifically, if the real-time level value of the reference device matches the level value of the reference device under the corresponding working condition, step S140 is performed, otherwise, step S150 is performed. Correspondingly, after the controller collects real-time operation data of the unit in the action period, the condenser liquid level value under the corresponding working condition is found from the database according to the data collected in each period, and is compared with the real-time liquid level value of the condenser collected in real time, and the opening of the throttle valve is periodically adjusted, so that the liquid level of the condenser in real time operation reaches the theoretical liquid level value under the corresponding working condition.
The manner of determining whether the real-time level value of the reference device in the real-time operating data matches the level value of the reference device is not unique, and in one embodiment, as shown in fig. 2, step S130 includes step S132 and step S134.
Step S132: and calculating the difference value between the real-time liquid level value of the reference device and the liquid level value of the reference device. Similarly, taking the condenser as a reference device for example, the real-time liquid level value of the condenser and the liquid level value of the condenser under the corresponding working condition may be a specific liquid level value of the condenser, or may be a percentage value of the liquid level of the condenser. And the condenser liquid level percentage value is the ratio of the condenser liquid level value to the total condenser liquid level height. Specifically, the controller may subtract a smaller value from a larger value of the real-time level value of the condenser and the level value of the condenser under the corresponding working condition to obtain a difference value; or the real-time liquid level value of the condenser and the liquid level value of the condenser under the corresponding working condition are subtracted, and then the absolute value is taken as the difference value.
Step S134: and if the difference value is less than or equal to the preset liquid level deviation value of the reference device, matching the real-time liquid level value of the reference device with the liquid level value of the reference device.
Correspondingly, the liquid level deviation value of the reference device is the liquid level deviation value of the condenser, and the specific value is not unique and can be adjusted according to the actual condition. Specifically, when the real-time liquid level value of the condenser and the liquid level value of the condenser under the corresponding working condition are liquid level values, the liquid level deviation value of the condenser can be a specific liquid level threshold value, and if the difference value between the real-time liquid level value of the condenser and the liquid level value of the condenser under the corresponding working condition is smaller than or equal to the liquid level threshold value, the real-time liquid level value of the condenser is considered to be matched with the liquid level value of the condenser under the corresponding working condition; otherwise, it is not matched. When the real-time level value of the condenser and the level value of the condenser under the corresponding working condition are percentage values, the deviation value of the liquid level of the condenser can also be set to be a percentage threshold value, for example, 3%. If the difference value between the real-time liquid level value of the condenser and the liquid level value of the condenser under the corresponding working condition is smaller than or equal to the percentage threshold value, the real-time liquid level value of the condenser is considered to be matched with the liquid level value of the condenser under the corresponding working condition; otherwise, it is not matched.
In addition, in other embodiments, the allowable deviation range determined by the condenser liquid level deviation value in step S130 may also be determined according to the condenser liquid level deviation value, and the allowable deviation range determined by the condenser liquid level deviation value of 3% is-3% to + 3% taking the liquid level value as an example to be a percentage value. The difference value between the real-time liquid level value of the condenser and the liquid level value of the condenser under the corresponding working condition can be a positive value or a negative value, whether the difference value is within a range of-3% to + 3% of an allowable deviation range or not is analyzed, and if yes, the real-time liquid level value of the condenser is matched with the liquid level value of the condenser under the corresponding working condition; otherwise, it is not matched.
Step S140: and controlling the throttle valve to keep the current opening unchanged. Specifically, in an action period, if the acquired condenser real-time liquid level value is matched with the condenser liquid level value under the corresponding working condition in the database, it is indicated that the difference value between the acquired condenser real-time liquid level value and the theoretical condenser liquid level value under the current working condition is within an allowable range, the liquid level of the condenser is not required to be adjusted in the current action period, the current opening degree of the throttle valve is kept unchanged, and frequent adjustment of the throttle valve is avoided.
Step S150: and adjusting the opening of the throttle valve according to the liquid level value of the reference device. If the collected condenser real-time liquid level value is not matched with the condenser liquid level value under the corresponding working condition in the database, the difference value between the collected condenser real-time liquid level value and the theoretical condenser liquid level value under the current working condition is beyond the allowable range, the liquid level of the condenser needs to be adjusted in the current action period, and the opening of the throttle valve is adjusted according to the condenser liquid level value under the corresponding working condition in the database.
Specifically, the corresponding relationship between the condenser level value and the target opening degree may be stored in the throttle valve, the controller may send the condenser level value under the current working condition in the database to the throttle valve after determining that the opening degree of the throttle valve needs to be adjusted, and the throttle valve may perform an opening or closing operation after determining the target opening degree according to the received condenser level value. For example, the throttle valve is increased in opening degree when the current opening degree is smaller than the target opening degree, and is decreased in opening degree when the current opening degree is larger than the target opening degree. It is understood that, in other embodiments, the controller may also store the corresponding relationship between the condenser level value and the target opening degree, and determine the target opening degree of the throttle valve according to the condenser level value under the current working condition in the database, so as to control the throttle valve to perform an opening or closing operation.
In one embodiment, as shown in FIG. 3, step S150 includes step S152 and step S154.
Step S152: and determining the target opening of the throttle valve according to the reference device level value. Specifically, the condenser level value under the current working condition in the database may be sent to the throttle valve by the controller, and the throttle valve determines the target opening according to the condenser level value under the current working condition.
Step S152: and adjusting the opening degree of the throttle valve according to the current opening degree and the target opening degree of the throttle valve. And the throttle valve adjusts the opening according to the relation between the current opening and the target opening, the opening is increased when the current opening is smaller than the target opening, and the opening is decreased when the current opening is larger than the target opening, so that the liquid level of the condenser in real-time operation reaches the liquid level value of the condenser under the current working condition.
According to the throttle valve control method, the operation data of the unit are collected in real time, and the throttle valve is controlled to adjust the opening degree only when the real-time liquid level value of the reference device in the unit is not matched with the liquid level value of the reference device under the corresponding working condition in the database, so that the influence on the stability of the unit operation parameters due to frequent opening and closing of the throttle valve is avoided, the superheat degree control is effectively realized, and the overall performance of the unit is improved.
It should be understood that although the various steps in the flow charts of fig. 1-3 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 1-3 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternating with other steps or at least some of the sub-steps or stages of other steps.
In one embodiment, a throttle control apparatus is also provided, as shown in fig. 4, including a data acquisition module 110, a data processing module 120, and an opening control module 130.
The data acquisition module 110 is used for acquiring real-time operation data of the unit; the data processing module 120 is configured to obtain a reference device level value under a corresponding working condition from a preset database according to the real-time operation data; the opening control module 130 is configured to determine whether a real-time level value of a reference device in the real-time operating data matches the level value of the reference device; if so, controlling the throttle valve to keep the current opening unchanged; if not, the opening of the throttle valve is adjusted according to the liquid level value of the reference device.
The database stores corresponding operation data of the organic unit under all operation conditions; the throttle valve is arranged on a liquid supply pipeline of the unit. The units may be chiller units. The specific structure of the unit is not unique, and the collected real-time operation data can be different according to different structures of the unit. The unit can include devices such as compressor, condenser, evaporimeter, flash tank and economic ware, and each device passes through the feed pipe way in the unit and communicates. The throttle valve is arranged on a liquid supply pipeline of the unit, the type of the throttle valve is not unique, and an electronic expansion valve can be adopted, and other valve devices can also be adopted. And the operation data stored in the database represents theoretical parameters of each device when the unit normally operates under different working conditions. A certain device in the unit can be used as a reference device, the current working condition of the unit can be determined according to the collected real-time operation data, and the liquid level value of the reference device under the current working condition is searched from the database and is used for being compared with the real-time liquid level value of the actually collected reference device. The reference device may be a condenser, an evaporator, a flash tank, or an economizer. Taking the example that the reference device selects the condenser, the real-time operation data includes the power, frequency, guide vane opening, evaporation pressure, evaporation temperature, condensation pressure, condensation temperature, freezing inlet and outlet water temperature, cooling inlet and outlet water temperature and condenser liquid level value of the unit.
The data can be acquired in real time according to the set action period to obtain the running data of the water cooling unit, and the running data can be used for carrying out comparative analysis and throttle valve adjustment according to the acquired data in each action period. After the real-time operation data of the unit are collected in the action period, the condenser liquid level value under the corresponding working condition is found from the database according to the data collected in each period, and is compared with the real-time liquid level value of the condenser collected in real time, and the opening of the throttle valve is periodically adjusted, so that the liquid level of the condenser in real time operation reaches the theoretical liquid level value under the corresponding working condition.
Specifically, in an action period, the acquired condenser real-time liquid level value is matched with the condenser liquid level value under the corresponding working condition in the database, so that the difference value between the acquired condenser real-time liquid level value and the theoretical condenser liquid level value under the current working condition is in an allowable range, the liquid level of the condenser does not need to be adjusted in the current action period, the current opening degree of the throttle valve is kept unchanged, and the throttle valve is prevented from being adjusted frequently.
If the collected condenser real-time liquid level value is not matched with the condenser liquid level value under the corresponding working condition in the database, the difference value between the collected condenser real-time liquid level value and the theoretical condenser liquid level value under the current working condition is beyond the allowable range, the liquid level of the condenser needs to be adjusted in the current action period, and the opening of the throttle valve is adjusted according to the condenser liquid level value under the corresponding working condition in the database. The corresponding relation between the condenser liquid level value and the target opening degree can be stored in the throttle valve, the condenser liquid level value under the current working condition in the database is sent to the throttle valve after the opening degree of the throttle valve is determined to be required to be adjusted, and the throttle valve executes the opening or closing action after the target opening degree is determined according to the received condenser liquid level value.
In one embodiment, the opening control module 130 calculates a difference between the real-time level value of the reference device and the level value of the reference device; and if the difference value is less than or equal to the preset liquid level deviation value of the reference device, matching the real-time liquid level value of the reference device with the liquid level value of the reference device.
Correspondingly, the real-time liquid level value of the condenser and the liquid level value of the condenser under the corresponding working condition can be specific liquid level values of the condenser, and can also be percentage values of the liquid level of the condenser. And the condenser liquid level percentage value is the ratio of the condenser liquid level value to the total condenser liquid level height. Specifically, the difference value can be obtained by subtracting the smaller value from the larger value of the real-time liquid level value of the condenser and the liquid level value of the condenser under the corresponding working condition; or the real-time liquid level value of the condenser and the liquid level value of the condenser under the corresponding working condition are subtracted, and then the absolute value is taken as the difference value.
When the real-time liquid level value of the condenser and the liquid level value of the condenser under the corresponding working condition are liquid level values, the liquid level deviation value of the condenser can be a specific liquid level threshold value, and if the difference value between the real-time liquid level value of the condenser and the liquid level value of the condenser under the corresponding working condition is smaller than or equal to the liquid level threshold value, the real-time liquid level value of the condenser is considered to be matched with the liquid level value of the condenser under the corresponding working condition; otherwise, it is not matched. When the real-time level value of the condenser and the level value of the condenser under the corresponding working condition are percentage values, the deviation value of the liquid level of the condenser can also be set to be a percentage threshold value, for example, 3%. If the difference value between the real-time liquid level value of the condenser and the liquid level value of the condenser under the corresponding working condition is smaller than or equal to the percentage threshold value, the real-time liquid level value of the condenser is considered to be matched with the liquid level value of the condenser under the corresponding working condition; otherwise, it is not matched.
In addition, in other embodiments, the opening degree control module 130 may also determine an allowable deviation range according to the condenser liquid level deviation value, analyze whether the difference value is within the allowable deviation range, and if so, match the real-time liquid level value of the condenser with the condenser liquid level value under the corresponding working condition; otherwise, it is not matched.
In one embodiment, the opening control module 130 determines a target opening of the throttle valve based on a reference device level value; and adjusting the opening degree of the throttle valve according to the current opening degree and the target opening degree of the throttle valve.
Specifically, the condenser level value under the current operating condition in the database may be sent to a throttle valve, and the throttle valve determines the target opening according to the condenser level value under the current operating condition. And the throttle valve adjusts the opening according to the relation between the current opening and the target opening, the opening is increased when the current opening is smaller than the target opening, and the opening is decreased when the current opening is larger than the target opening, so that the liquid level of the condenser in real-time operation reaches the liquid level value of the condenser under the current working condition.
For specific limitations of the throttle control device, reference may be made to the limitations of the throttle control method described above, and further description thereof is omitted here. The modules in the throttle valve control device can be wholly or partially realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
According to the throttle valve control device, the operation data of the unit are collected in real time, and the throttle valve is controlled to adjust the opening degree only when the real-time liquid level value of the reference device in the unit is not matched with the liquid level value of the reference device under the corresponding working condition in the database, so that the influence on the stability of the unit operation parameters due to frequent opening and closing of the throttle valve is avoided, the superheat degree control is effectively realized, and the overall performance of the unit is improved.
In one embodiment, the compression steam circulation system comprises a unit, a throttle valve and a controller, wherein the throttle valve is arranged on a liquid supply pipeline of the unit, the controller is connected with the throttle valve, and the controller performs throttle valve control according to the method. In one embodiment, the unit is a water chiller unit. The unit can specifically include devices such as compressor, condenser, evaporimeter, flash tank and economic ware, and each device passes through the feed pipe way and communicates in the unit. The throttle valve is arranged on a liquid supply pipeline of the unit, the type of the throttle valve is not unique, and an electronic expansion valve can be adopted, and other valve devices can also be adopted. In this embodiment, the throttle valve is an electronic expansion valve.
According to the compression steam circulation system, the operation data of the unit are collected in real time, and the throttle valve is controlled to adjust the opening degree only when the real-time liquid level value of the reference device in the unit is not matched with the liquid level value of the reference device in the database under the corresponding working condition, so that the influence on the stability of the operation parameters of the unit caused by frequent opening and closing of the throttle valve is avoided, the superheat degree control is effectively realized, and the overall performance of the unit is improved.
In one embodiment, an air conditioner is also provided, which comprises the compression steam circulation system.
According to the air conditioner, the operation data of the unit are collected in real time, and the throttle valve is controlled to adjust the opening degree only when the real-time liquid level value of the reference device in the unit is not matched with the liquid level value of the reference device under the corresponding working condition in the database, so that the influence on the stability of the operation parameters of the unit caused by frequent opening and closing of the throttle valve is avoided, the superheat degree control is effectively realized, and the overall performance of the unit is improved.
In order to better understand the above throttle valve control method, apparatus, compressed vapor cycle system and air conditioner, a detailed explanation will be given below with reference to specific embodiments.
According to the throttle valve control scheme, the water chiller group data in the running process are detected in real time and paired with the data in the database, and the condenser liquid level value under the corresponding working condition is paired. When the real-time liquid level value and the liquid level value obtained by matching are outside the liquid level deviation value of the condenser, the electronic expansion valve acts to adjust the real-time liquid level of the condenser to the matching value; otherwise, the electronic expansion valve is not actuated. The throttle valve control scheme can solve the problems that when the electronic expansion valve is controlled by taking the exhaust superheat degree and the suction superheat degree as main control signals, the adjusting range is narrow, the variable is small in the adjustable range, and the control precision is not high enough. The throttle valve control scheme can also solve the problems that the electronic expansion valve overshoots when being controlled according to the exhaust superheat degree and the suction superheat degree, and the operation of the unit is difficult to stabilize, can determine that the electronic expansion valve is positioned at a reasonable opening degree under different working conditions, and improves the reliability and stability of the operation of the unit.
Specifically, as shown in fig. 5, in the throttle valve control scheme provided by the application, a water chilling unit operation database control system is used for throttling, and a storage module, a detection module and a judgment module are arranged, which are mainly embodied that the opening degree of an electronic expansion valve is controlled according to the liquid level deviation value of a condenser.
The storage module stores a unit operation database in the unit, the stored data comprises the power, the frequency, the guide vane opening, the evaporation pressure, the evaporation temperature, the condensation pressure, the condensation temperature, the freezing inlet and outlet water temperature, the cooling inlet and outlet water temperature and the corresponding condenser liquid level value of the corresponding water chilling unit under all the operation working conditions of the unit, and each data of the database can be summarized by the unit through a plurality of times of test analysis.
The detection module detects the operation data of the water chiller required by control: power, frequency, guide vane opening, evaporation pressure, evaporation temperature, condensation pressure, condensation temperature, freezing inlet and outlet water temperature, cooling inlet and outlet water temperature, condenser liquid level value and electronic expansion valve opening.
The judging module is used for matching the detected operation data of the water chiller with the data in the database and judging the level value of the condenser under the corresponding working condition; and sending the liquid level value to an electronic expansion valve, and periodically adjusting the opening degree of the electronic expansion valve to enable the liquid level of the condenser to reach the liquid level value during real-time operation.
Wherein, the control of judging module is as follows, in order to avoid electronic expansion valve frequent switch, influence unit operating parameter stability and extension electronic expansion valve life-span:
when one action cycle: within 10s (adjustable value):
(1) the real-time liquid level value of the condenser-the liquid level value of the condenser in the current working condition database is less than or equal to the liquid level deviation value of the condenser: 3 percent (the value can be adjusted), the liquid level adjusting output value of the condenser in the period is 0 percent, and the electronic expansion valve keeps the current opening degree not to act.
(2) The real-time liquid level value of the condenser-the liquid level value of the condenser in the current working condition database is | > the liquid level deviation value of the condenser: and 3 percent (the value is adjustable), the output target value of the liquid level adjustment of the condenser in the period is the 'matched condenser liquid level value in the database', and the electronic expansion valve executes the action of opening or closing according to the target value of the liquid level.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (12)
1. A throttle valve control method, characterized by comprising:
collecting real-time operation data of the unit;
acquiring a reference device liquid level value under a corresponding working condition from a preset database according to the real-time operation data;
judging whether the real-time level value of a reference device in the real-time operation data is matched with the level value of the reference device;
if so, controlling the throttle valve to keep the current opening unchanged;
if not, the opening of the throttle valve is adjusted according to the liquid level value of the reference device.
2. The throttle valve control method of claim 1, wherein the reference device is a condenser, an evaporator, a flash tank, or an economizer.
3. The throttle valve control method of claim 1, wherein the reference device is a condenser, and the real-time operation data includes a power, a frequency, a vane opening, an evaporation pressure, an evaporation temperature, a condensation pressure, a condensation temperature, a chilled inlet and outlet water temperature, a cooling inlet and outlet water temperature, and a condenser level value of the unit.
4. The throttle control method of claim 1, wherein the determining whether a real-time level value of a reference device in the real-time operating data matches the reference device level value comprises:
calculating the difference value between the real-time liquid level value of the reference device and the liquid level value of the reference device;
and if the difference value is less than or equal to a preset reference device liquid level deviation value, matching the real-time liquid level value of the reference device with the liquid level value of the reference device.
5. The throttle valve control method according to claim 1, wherein the adjusting the opening degree of the throttle valve according to the reference device level value includes:
determining the target opening degree of the throttle valve according to the liquid level value of the reference device;
and adjusting the opening of the throttle valve according to the current opening and the target opening of the throttle valve.
6. The throttle control method according to any one of claims 1 to 5, wherein the database stores operation data corresponding to all operation conditions of the organic group.
7. The throttle valve control method according to any one of claims 1 to 5, wherein the throttle valve is provided in a liquid supply line of the unit.
8. A throttle valve control apparatus, characterized by comprising:
the data acquisition module is used for acquiring real-time operation data of the unit;
the data processing module is used for acquiring the liquid level value of the reference device under the corresponding working condition from a preset database according to the real-time operation data;
the opening control module is used for judging whether the real-time level value of the reference device in the real-time operation data is matched with the level value of the reference device; if so, controlling the throttle valve to keep the current opening unchanged; if not, the opening of the throttle valve is adjusted according to the liquid level value of the reference device.
9. A compression steam cycle system comprising a unit, a throttle valve provided in a supply line of the unit, and a controller connected to the throttle valve, wherein the controller performs throttle control according to the method of any one of claims 1 to 7.
10. The compression vapor cycle system of claim 9, wherein the unit is a water chiller unit.
11. The compression vapor cycle system of claim 9, wherein the throttle valve is an electronic expansion valve.
12. An air conditioner characterized by comprising the compression vapor cycle system according to any one of claims 9 to 11.
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| CN202010938933.0A CN112082293A (en) | 2020-09-09 | 2020-09-09 | Throttle valve control method and device, compressed steam circulation system and air conditioner |
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| CN202010938933.0A CN112082293A (en) | 2020-09-09 | 2020-09-09 | Throttle valve control method and device, compressed steam circulation system and air conditioner |
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Cited By (1)
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| CN112665225A (en) * | 2020-12-22 | 2021-04-16 | 珠海格力电器股份有限公司 | Throttle control device, heat pump centrifugal unit and air conditioning system |
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