CN113280461A - Control method and control device for throttling unit of refrigeration system, storage medium and refrigeration system - Google Patents
Control method and control device for throttling unit of refrigeration system, storage medium and refrigeration system Download PDFInfo
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- CN113280461A CN113280461A CN202110592816.8A CN202110592816A CN113280461A CN 113280461 A CN113280461 A CN 113280461A CN 202110592816 A CN202110592816 A CN 202110592816A CN 113280461 A CN113280461 A CN 113280461A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
Abstract
The invention provides a control method, a control device, a storage medium and a refrigeration system of a throttling unit of the refrigeration system, wherein the refrigeration system comprises a heat exchange unit and at least two throttling units, the at least two throttling units are connected in parallel and then are connected with the heat exchange unit, and the control method comprises the following steps: obtaining a refrigeration load Q of the heat exchange unit; accumulating rated refrigerating capacities of a preset number of throttling units in the at least two throttling units in sequence until the total customized refrigerating capacity Q' is more than or equal to the refrigerating load Q; and controlling the opening degree of the throttling unit participating in the accumulation of the rated refrigerating capacity to be a preset opening degree. According to the control method of the throttling units of the refrigerating system, the optimal number of the throttling units participating in refrigerant regulation can be determined according to the actual working condition of the heat exchange unit, the throttling units with the optimal number are controlled to regulate the refrigerant, the control precision of the refrigerant circulation quantity is improved, and the reliability of the refrigerating system is improved.
Description
Technical Field
The disclosure belongs to the technical field of multi-split air conditioners, and particularly relates to a control method and a control device for a throttling unit of a refrigerating system, a storage medium and the refrigerating system.
Background
Because the multi-connected air conditioner outdoor unit can be designed in a modularized mode, the occupied area is small, the installation is convenient, the maintenance is easy, and the like, the air conditioner scheme of the multi-connected air conditioner outdoor unit matched with the air treatment combination cabinet is more and more applied to large and medium energy-saving buildings. In order to adjust the refrigerant circulation quantity of the heat exchanger in the air treatment combined cabinet, an electronic expansion valve device is adopted to connect the multi-connected outdoor unit and the air combined cabinet. The refrigeration requirement of large and medium-sized buildings is large (more than 100 kW), and is limited by factors such as pipe diameter, flow, opening degree and the like, and a single electronic expansion valve device cannot meet the large refrigeration requirement. However, when a plurality of electronic expansion valve device modules are combined, the refrigerant amount adjustment accuracy is lowered. Under the condition that the refrigerating capacity of the outdoor unit of the air conditioner is greater than the refrigerating load demand of the air combination cabinet, due to synchronous regulation of the electronic expansion valves, the phenomenon of overlarge regulation can occur, so that the liquid return risk of the compressor is caused, and the reliability and the service life of the air conditioning system are greatly influenced.
Disclosure of Invention
Therefore, the technical problem to be solved by the present disclosure is to provide a method and a device for controlling a throttle unit of a refrigeration system, a storage medium, and a refrigeration system, in which the refrigerant quantity adjustment accuracy is low due to the combined use of a plurality of electronic expansion valves.
In order to solve the above problems, the present disclosure provides a method for controlling a throttling unit of a refrigeration system, where the refrigeration system includes a heat exchange unit and at least two throttling units, the at least two throttling units are connected in parallel and then connected to the heat exchange unit, and the method includes:
obtaining a refrigeration load Q of the heat exchange unit;
accumulating rated refrigerating capacities of a preset number of throttling units in the at least two throttling units in sequence until the total customized refrigerating capacity Q' is more than or equal to the refrigerating load Q;
and controlling the opening degree of the throttling unit participating in the accumulation of the rated refrigerating capacity to be a preset opening degree.
In some embodiments, further comprising: and controlling the opening degree of the throttling unit which does not participate in the accumulation of the rated refrigerating capacity to be kept at 0.
In some embodiments, the step of sequentially accumulating the rated cooling capacities of a preset number of throttling units in the at least two throttling units until the total customized cooling capacity Q' is greater than or equal to the cooling load Q includes:
and the at least two throttling units are sequenced according to rated refrigerating capacity and are sequentially accumulated from small to large.
In some embodiments, the step of obtaining the refrigeration load Q includes:
and determining the refrigeration load Q according to the outdoor environment temperature, the set temperature of the heat exchange unit and the rated refrigerating capacity of the heat exchange unit.
In some embodiments, the refrigeration load Q is the rated refrigeration capacity Q of the heat exchange unitHeat exchange unitX outer loop correction coefficient tOuter coverX is set to correct the correction number tIs provided with。
In some embodiments, further comprising: and adjusting the opening degree of the throttling unit with the preset opening degree according to the superheat degree T of the heat exchange unit.
In some embodiments, in the step of adjusting the opening degree of the throttle unit with a preset opening degree according to the superheat degree T of the heat exchange unit, the opening degree variation of the throttle unit with the preset opening degree is the same.
In some embodiments, the superheat degree T of the heat exchange unit is a difference value obtained by subtracting a temperature detection value of the refrigerant inlet pipe from a temperature detection value of the refrigerant outlet pipe.
In some embodiments, further comprising: and adjusting the number of the throttling units participating in the accumulation of the rated refrigerating capacity according to the superheat degree T of the heat exchange unit.
In some embodiments, further comprising:
obtaining the superheat degree T of the heat exchange unit;
if the superheat degree T is less than a preset value A, and the duration is more than or equal to M;
the number of throttling units participating in the accumulation of the rated refrigerating capacity is reduced.
In some embodiments, the step of reducing the number of throttling units participating in the rated cooling capacity accumulation includes:
and reducing the rated refrigerating capacity of the throttling unit participating in the rated refrigerating capacity accumulation according to the sequence from small to large.
In some embodiments, further comprising:
obtaining the superheat degree T of the heat exchange unit;
if the superheat degree T is larger than a preset value B, and the duration is longer than or equal to N;
the number of throttling units participating in the accumulation of the rated refrigerating capacity is increased.
In some embodiments, the step of increasing the number of throttling units participating in the rated cooling capacity accumulation includes:
and increasing the rated refrigerating capacity of the throttling unit which does not participate in the rated refrigerating capacity accumulation according to the sequence from small to large.
In some embodiments, the throttling unit is at least one of an electronic expansion valve and a pressure expansion valve.
The utility model provides a controlling means of refrigerating system's throttle unit, refrigerating system include heat exchange unit and at least two throttle units, at least two throttle unit parallel connection back with heat exchange unit connects, controlling means includes:
a first control unit configured to be able to acquire a refrigeration load Q of the heat exchange unit;
the second control unit is configured to accumulate rated refrigerating capacity of the throttling units in the at least two throttling units until the total customized refrigerating capacity Q' is more than or equal to the refrigerating load Q;
and the third control unit is configured to be capable of controlling the opening degree of the throttling unit participating in the accumulation of the rated refrigerating capacity to be a preset opening degree.
The purpose of the present disclosure and the technical problems solved thereby can be further achieved by the following technical measures.
In some embodiments, the third control unit is further configured to control the opening degree of the throttling unit not participating in the rated cooling capacity accumulation to be kept at 0.
In some embodiments, the heat exchanger further comprises a fourth control unit configured to adjust the opening degree of the throttling unit with a preset opening degree according to the superheat degree T of the heat exchange unit.
In some embodiments, further comprising:
a first detection unit configured to be able to detect a temperature of the refrigerant outlet pipe;
the second detection unit is configured to be capable of detecting the temperature of the refrigerant inlet pipe;
and the fifth control unit is configured to calculate the superheat degree T of the heat exchange unit according to the temperature of the refrigerant outlet pipe and the temperature of the refrigerant inlet pipe.
In some embodiments, the system further comprises a sixth control unit which is configured to be capable of controlling and reducing the number of the throttling units participating in the accumulation of the rated refrigerating capacity when the superheat degree T is less than the preset value A and the duration is more than or equal to M.
In some embodiments, the sixth control unit is further configured to be capable of controlling to increase the number of the throttling units participating in the accumulation of the rated refrigerating capacity when the superheat degree T is greater than a preset value B and the duration is greater than or equal to N.
A readable storage medium adopts the control method of the throttling unit of the refrigeration system.
A refrigerating system adopts the control method of the throttling unit or the control device of the throttling unit.
The control method, the control device, the storage medium and the refrigeration system of the throttling unit of the refrigeration system provided by the disclosure have at least the following beneficial effects:
according to the control method of the throttling units of the refrigerating system, the optimal number of the throttling units participating in refrigerant regulation can be determined according to the actual working condition of the heat exchange unit, the throttling units with the optimal number are controlled to regulate the refrigerant, the control precision of the refrigerant circulation quantity is improved, and the reliability of the refrigerating system is improved.
Drawings
FIG. 1 is a schematic flow chart diagram of a control method according to an embodiment of the disclosure;
FIG. 2 is a schematic diagram of a two throttling unit refrigeration system according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a refrigeration system with three throttling units according to an embodiment of the present disclosure.
The reference numerals are represented as:
1. an outdoor unit; 2. a first throttling unit; 3. a second throttling unit; 4. a throttle unit control box; 5. a heat exchange unit; 6. a refrigerant inlet pipe temperature sensing bulb; 7. the refrigerant is discharged from the pipe temperature sensing bulb.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, the following embodiments of the present disclosure will be clearly and completely described in conjunction with the accompanying drawings. It is to be understood that the described embodiments are merely a subset of the disclosed embodiments and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
With reference to fig. 1 to 3, the present disclosure provides a method for controlling a throttling unit of a refrigeration system, where the refrigeration system includes a heat exchange unit 5 and at least two throttling units, such as a first throttling unit 2 and a second throttling unit 3, the at least two throttling units are connected in parallel and then connected to the heat exchange unit 5, and the method includes:
s101, obtaining a refrigeration load Q of the heat exchange unit.
In engineering application, in order to meet the refrigeration effect of a building at high temperature, a designer often uses the local highest temperature as the design temperature of an air conditioner, so that the refrigeration capacity of equipment is greater than the daily refrigeration load requirement of the building. Therefore, when the air conditioner is used for daily refrigeration, the phenomenon of overlarge adjustment can occur due to synchronous adjustment of the electronic expansion valves, so that more refrigerants are generated, the liquid return of the compressor is caused, and the influence on the reliability and the service life of a refrigeration system such as an air conditioning system is large. Therefore, in this embodiment, the refrigeration load Q of the heat exchange unit, such as an air handling combination cabinet, in the current environment is determined, and then the control strategy of the throttling unit is determined according to the actual situation, so that the control accuracy of the refrigerant circulation amount is improved, and the reliability of the refrigeration system is improved.
In some embodiments, the step of obtaining the refrigeration load Q includes:
s1011 determines the refrigeration load Q according to the outdoor environment temperature, the set temperature of the heat exchange unit and the rated refrigerating capacity of the heat exchange unit.
In this embodiment, the size of the refrigeration load Q under the current use condition is determined according to the current outdoor environment temperature, the set temperature of the heat exchange unit 5, and the rated refrigeration capacity, and then the control strategy of the throttling unit is determined according to the actual situation, so that the control precision of the refrigerant circulation volume is improved, and the reliability of the refrigeration system is improved.
In some embodiments, the refrigeration load Q is the rated refrigeration capacity Q of the heat exchange unitHeat exchange unitX outer loop correction coefficient tOuter coverX is set to correct the correction number tIs provided with。
Preferably, the rated refrigerating capacity Q of the heat exchange unitHeat exchange unitThe outer ring correction coefficient t can be inquired through a product name plate, a use instruction and the like of the heat exchange unit 5Outer coverThe set correction number tIs provided withAll the parameters are determined according to the rated refrigerating capacity of the refrigerating system, the current outdoor environment temperature, the indoor environment temperature and the like.
In this embodiment, the refrigerating load Q is rated by the refrigerating capacity Q of the heat exchange unitHeat exchange unitOuter loop correction factor tOuter coverSetting a correction number tIs provided withThe calculated temperature can change in real time along with the external environment temperature and the set temperature, the refrigeration load Q of the heat exchange unit is accurately reflected, and the refrigeration load Q is determined according to actual conditionsThe control strategy of the throttling unit improves the control precision of the refrigerant circulation quantity and improves the reliability of the refrigerating system.
S102, accumulating the rated refrigerating capacity of the preset number of throttling units in the at least two throttling units in sequence until the total customized refrigerating capacity Q' is more than or equal to the refrigerating load Q.
Preferably, the predetermined number is 1, i.e. the rated cooling capacity of only one throttling unit is accumulated at a time.
In the related art, when a plurality of electronic expansion valves are controlled in a linkage manner, a control strategy of synchronous adjustment is adopted, so that the phenomenon of overlarge adjustment can occur, the refrigerant is excessive, and the liquid return of the compressor occurs. In this embodiment, the number of the electronic expansion valves that need to participate in refrigerant regulation needs to be measured according to the actual refrigeration load Q of the heat exchange unit 5, specifically, the total rated refrigeration capacity Q ' of the plurality of electronic expansion valves to be subjected to linkage control is obtained by accumulating according to the rated refrigeration capacity Q of the electronic expansion valves, and in the accumulation process, after each accumulation, the total rated refrigeration capacity Q ' is compared with the refrigeration load Q, and when the total rated refrigeration capacity Q ' is greater than or equal to the refrigeration load Q, it is indicated that the electronic expansion valves participating in accumulation can meet the refrigerant transportation of the heat exchange unit 5 under the current working condition. At the moment, the precise control of the refrigerant circulation amount can be ensured only by controlling the electronic expansion valves participating in the accumulation, the problems of liquid return of the compressor and the like caused by excessive refrigerants can be avoided, and the reliability of the refrigerating system is improved.
In some embodiments, the step of adding the rated cooling capacities of the throttling units in the at least two throttling units until the total customized cooling capacity Q' is greater than or equal to the cooling load Q includes:
and the at least two throttling units are sequenced according to rated refrigerating capacity and are sequentially accumulated from small to large.
Preferably, when the throttling unit is an electronic expansion valve, the type of the electronic expansion valve comprises a single electronic expansion valve and a double electronic expansion valve, each electronic expansion valve is connected with a throttling unit control box, and the electronic expansion valves are all arranged through the throttling unit control boxes after being installed and have different rated refrigerating capacities. Rated cooling capacities of different electronic expansion valves are set to Q1, Q2, and Q3 … … Qn, respectively, and further, the total customized cooling capacity Q' is Q1+ Q2+ Q3+ … … + Qn. In this embodiment, the first throttling unit 2 is a single electronic expansion valve, and the second throttling unit 3 is a double electronic expansion valve, the refrigeration system shown in fig. 1 includes one first throttling unit 2 and one second throttling unit 3, and the refrigeration system shown in fig. 2 includes one first throttling unit 2 and two second throttling units 3.
In this embodiment, the refrigeration system first determines whether the electronic expansion valve is on-line through the roll call program, and determines that the electronic expansion valve is on-line when receiving the signal feedback. And sequencing the on-line electronic expansion valves according to the set rated refrigerating capacity. And sequentially accumulating according to the rated refrigerating capacity from small to large, obtaining the total customized refrigerating capacity Q 'after accumulation, comparing the total customized refrigerating capacity Q' with the refrigerating load Q, finishing accumulation if Q 'is more than or equal to Q, and continuously accumulating the rated refrigerating capacity of the next electronic expansion valve if Q' is less than Q. Q ' is reassigned after each accumulation, e.g., Q ' Q1+ Q2 after the first accumulation, Q ' Q1+ Q2+ Q3 after the second accumulation, and so on.
Therefore, when the throttling units of the embodiment accumulate and calculate the total customized cooling capacity Q', the throttling units are accumulated in a sequence from small to large, the throttling units with small rated cooling capacity are preferentially adopted, and then the throttling units with large customized cooling capacity are gradually adopted, so that the reasonable distribution of the refrigerant is achieved, the bias flow of the refrigerant is avoided, and even the liquid return of the compressor is avoided.
S103, controlling the opening degree of the throttling unit participating in the accumulation of the rated refrigerating capacity to be a preset opening degree.
Preferably, the preset opening degree meets the opening degree of the refrigeration system in normal work according to the rated refrigerating capacity of the refrigeration system, the current outdoor environment temperature, the indoor environment temperature and other parameters.
In the embodiment, the number of the throttling units meeting the refrigerant requirement of the heat exchange unit 5 under the current working condition is identified by judging that the gross customized refrigeration capacity Q' is not less than the refrigeration load Q, the accurate control of the refrigerant circulation quantity can be ensured only by controlling the electronic expansion valves participating in accumulation, the problems of liquid return of the compressor and the like caused by excessive refrigerants can be avoided, and the reliability of the refrigeration system is improved.
In some embodiments, further comprising:
and S104, controlling the opening degree of the throttling unit which does not participate in the accumulation of the rated refrigerating capacity to be kept at 0.
In the related art, since the synchronous control of all the electronic expansion valves may cause the refrigerant supply exceeding the refrigeration requirement of the heat exchange unit 5, and the refrigerant is too much, resulting in the liquid return of the compressor, in this embodiment, only the electronic expansion valve just meeting the refrigeration requirement is opened to supply the refrigerant to the heat exchange unit 5, and the opening degree of the electronic expansion valve exceeding the refrigeration requirement is kept to be 0, and the electronic expansion valve does not participate in the refrigerant control under the current working condition. However, when the refrigeration load Q of the heat exchange unit changes, which results in an increase in refrigeration demand, the electronic expansion valve with the opening degree of 0 can be started to increase the total customized refrigeration capacity Q' to match the refrigeration load Q.
In some embodiments, further comprising:
s105, adjusting the opening degree of the throttling unit with the preset opening degree according to the superheat degree T of the heat exchange unit 5.
In the embodiment, in the normal movement process of the refrigeration system, the opening degree of the throttling unit participating in refrigerant regulation is regulated through the superheat degree T of the heat exchange unit 5, the refrigerant circulation quantity in the system is ensured, the control precision of the throttling unit is improved, the problems of liquid return of a compressor and the like caused by excessive refrigerants can be avoided, and the reliability of the refrigeration system is improved.
In some embodiments, in the step of adjusting the opening degree of the throttle unit with a preset opening degree according to the superheat degree of the heat exchange unit 5, the opening degree of the throttle unit with the preset opening degree has the same change amount.
In this embodiment, the opening degree variation amounts of the throttling units participating in the refrigerant regulation are the same, so that the throttling devices are ensured to have the same control step number as the electronic expansion valves, and step loss is not easily caused. In the related art, the actual opening degree of the electronic expansion valve cannot be positioned in real time without a feedback signal, and only after the electronic expansion valve is completely closed, the actual opening degree is defaulted to 0 and is opened to be larger on the basis of 0, so that the electronic expansion valve is easy to be out of step under the condition of differential control of a plurality of throttling units. Meanwhile, the plurality of throttling units are synchronously controlled, and can share the same signal terminal, so that the control cost is saved.
In some embodiments, the superheat T of the heat exchange unit 5 is a difference value obtained by subtracting a temperature detection value of the refrigerant inlet pipe from a temperature detection value of the refrigerant outlet pipe. Preferably, the temperature of the refrigerant inlet pipe is measured by the refrigerant inlet pipe temperature sensing bulb 6, the temperature of the refrigerant outlet pipe is measured by the refrigerant outlet pipe temperature sensing bulb 7, and a communication line between the refrigerant inlet pipe temperature sensing bulb 6 and the refrigerant outlet pipe temperature sensing bulb 7 may be connected to the throttling unit control box 4.
Therefore, according to the method of the embodiment, the opening degree of the throttling unit can be adjusted according to the difference value between the inlet pipe temperature and the outlet pipe temperature of the heat exchange unit 5, the circulation quantity of the refrigerant in the system is ensured, the control precision of the throttling unit is improved, the problems of liquid return and the like of the compressor caused by excessive refrigerant can be avoided, and the reliability of the refrigeration system is improved.
When the external environment temperature and the set temperature change, the refrigeration load Q of the heat exchange unit 5 changes, and at this time, the total customized refrigeration capacity Q' of the electronic expansion valve participating in refrigerant regulation may exceed the refrigeration load Q too much or be lower than the refrigeration load Q, and the refrigerant circulation capacity of the refrigeration system does not meet the refrigeration requirement.
Thus, in some embodiments, further comprising:
s106, adjusting the number of the throttling units participating in the accumulation of rated refrigerating capacity according to the superheat degree T of the heat exchange units.
Therefore, under the condition that the working condition of the heat exchange unit 5 changes, the control strategy of the throttling unit is determined according to the actual condition, the control precision of the refrigerant circulation quantity is improved, and the reliability of the refrigerating system is improved.
In some embodiments, further comprising:
s1061, acquiring the superheat degree T of the heat exchange unit 6; if the superheat degree T is less than a preset value A, and the duration is more than or equal to M; the number of throttling units participating in the accumulation of the rated refrigerating capacity is reduced.
Therefore, the number of the throttling units can be adjusted by combining the superheat degree T of the heat exchange unit 5, the throttling units with proper number in the system are guaranteed to work all the time, the accurate control of the circulation quantity of the refrigerant is guaranteed, the problems that the liquid returns of the compressor and the like due to too much refrigerant can be avoided, and the reliability of the refrigerating system is improved.
In some embodiments, the step of reducing the number of throttling units participating in the rated cooling capacity accumulation includes:
and reducing the rated refrigerating capacity of the throttling unit participating in the rated refrigerating capacity accumulation according to the sequence from small to large.
In the process of reducing the throttling units participating in refrigerant regulation, according to the sequence from small to large, the influence of the turn-off of the throttling units on the refrigerant circulation of the system is reduced, the reasonable distribution of the refrigerant in different throttling units in the system is ensured, the accurate control of the refrigerant circulation quantity is ensured, the problems of liquid return of the compressor and the like caused by too much refrigerant can be avoided, and the reliability of the refrigerating system is improved.
In some embodiments, further comprising:
s1062, acquiring the superheat degree T of the heat exchange unit; if the superheat degree T is larger than a preset value B, and the duration is longer than or equal to N; the number of throttling units participating in the accumulation of the rated refrigerating capacity is increased.
Therefore, the number of the throttling units can be adjusted by combining the superheat degree T of the heat exchange unit 5, the throttling units with proper number in the system are guaranteed to work all the time, the accurate control of the circulation quantity of the refrigerant is guaranteed, the problems that the liquid returns of the compressor and the like due to too much refrigerant can be avoided, and the reliability of the refrigerating system is improved.
In some embodiments, the step of increasing the number of throttling units participating in the rated cooling capacity accumulation includes:
and increasing the rated refrigerating capacity of the throttling unit which does not participate in the rated refrigerating capacity accumulation according to the sequence from small to large.
In the process of adding the throttling units participating in refrigerant regulation, according to the sequence from small to large, the influence of the opening of the throttling units on the refrigerant circulation of the system is reduced, the reasonable distribution of the refrigerant in different throttling units in the system is ensured, the accurate control of the refrigerant circulation quantity is ensured, the problems of liquid return of the compressor and the like caused by too much refrigerant can be avoided, and the reliability of the refrigerating system is improved.
In some embodiments, the throttling unit comprises an electronic expansion valve, a pressure expansion valve. The electronic expansion valves comprise single electronic expansion valves and double electronic expansion valves, each electronic expansion valve is connected with a throttling unit control box, and the electronic expansion valves are different in rated refrigerating capacity and are set through the throttling unit control boxes after being installed.
The embodiment of the present disclosure further provides a control device for a throttling unit of a refrigeration system, where the refrigeration system includes a heat exchange unit and at least two throttling units, the at least two throttling units are connected in parallel and then connected to the heat exchange unit, and the control device includes:
a first control unit configured to be able to acquire a refrigeration load Q of the heat exchange unit;
the second control unit is configured to accumulate rated refrigerating capacity of the throttling units in the at least two throttling units until the total customized refrigerating capacity Q' is more than or equal to the refrigerating load Q;
and the third control unit is configured to be capable of controlling the opening degree of the throttling unit participating in the accumulation of the rated refrigerating capacity to be a preset opening degree.
The control device of the embodiment of the disclosure can determine the optimal number of the throttling units participating in refrigerant regulation according to the actual working condition of the heat exchange unit 5, and control the throttling units of the optimal number to regulate the refrigerant, thereby improving the control precision of the refrigerant circulation amount and improving the reliability of the refrigeration system.
In some embodiments, the third control unit is further configured to control the opening degree of the throttling unit not participating in the rated cooling capacity accumulation to be kept at 0.
Therefore, in this embodiment, only the number of the electronic expansion valves that just meet the refrigeration requirement is opened, refrigerant is supplied to the heat exchange unit 5, the opening degree of the electronic expansion valves exceeding the refrigeration requirement is kept at 0, and the electronic expansion valves do not participate in refrigerant control under the current working condition.
In some embodiments, the heat exchanger further comprises a fourth control unit configured to adjust the opening degree of the throttling unit with a preset opening degree according to the superheat degree T of the heat exchange unit.
Therefore, in the normal movement process of the refrigeration system in the embodiment, the opening degree of the throttling unit participating in refrigerant regulation is regulated through the superheat degree T of the heat exchange unit 5, the refrigerant circulation quantity in the system is ensured, the control precision of the throttling unit is improved, the problems of liquid return of a compressor and the like caused by excessive refrigerants can be avoided, and the reliability of the refrigeration system is improved.
In some embodiments, further comprising:
a first detection unit configured to be able to detect a temperature of the refrigerant outlet pipe;
the second detection unit is configured to be capable of detecting the temperature of the refrigerant inlet pipe;
and the fifth control unit is configured to calculate the superheat degree T of the heat exchange unit according to the temperature of the refrigerant outlet pipe and the temperature of the refrigerant inlet pipe.
Therefore, according to the method of the embodiment, the opening degree of the throttling unit can be adjusted according to the difference value between the inlet pipe temperature and the outlet pipe temperature of the heat exchange unit 5, the circulation quantity of the refrigerant in the system is ensured, the control precision of the throttling unit is improved, the problems of liquid return and the like of the compressor caused by excessive refrigerant can be avoided, and the reliability of the refrigeration system is improved.
In some embodiments, the system further comprises a sixth control unit which is configured to be capable of controlling and reducing the number of the throttling units participating in the accumulation of the rated refrigerating capacity when the superheat degree T is less than the preset value A and the duration is more than or equal to M. The sixth control unit is also configured to be capable of controlling and increasing the number of the throttling units participating in the accumulation of the rated refrigerating capacity when the superheat degree T is larger than a preset value B and the duration is longer than or equal to N.
Therefore, the number of the throttling units can be adjusted by combining the superheat degree T of the heat exchange unit 5, the throttling units with proper number are guaranteed to work all the time in the system, the accurate control of the circulation quantity of the refrigerant is guaranteed, the problems that the liquid returns of the compressor and the like due to too much refrigerant can be avoided, and the reliability of the refrigerating system is improved.
A readable storage medium adopts the control method of the throttling unit of the refrigeration system.
A refrigerating system adopts the control method of the throttling unit or the control device of the throttling unit.
It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.
The present disclosure is to be considered as limited only by the preferred embodiments and not limited to the specific embodiments described herein, and all changes, equivalents and modifications that come within the spirit and scope of the disclosure are desired to be protected. The foregoing is only a preferred embodiment of the present disclosure, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present disclosure, and these improvements and modifications should also be considered as the protection scope of the present disclosure.
Claims (22)
1. A control method of a throttling unit of a refrigeration system is characterized in that the refrigeration system comprises a heat exchange unit and at least two throttling units, the at least two throttling units are connected in parallel and then are connected with the heat exchange unit, and the control method comprises the following steps:
obtaining a refrigeration load Q of the heat exchange unit;
accumulating rated refrigerating capacities of a preset number of throttling units in the at least two throttling units in sequence until the total customized refrigerating capacity Q' is more than or equal to the refrigerating load Q;
and controlling the opening degree of the throttling unit participating in the accumulation of the rated refrigerating capacity to be a preset opening degree.
2. The method of controlling a throttling unit of a refrigeration system of claim 1, further comprising: and controlling the opening degree of the throttling unit which does not participate in the accumulation of the rated refrigerating capacity to be kept at 0.
3. The method for controlling the throttling unit of the refrigerating system according to claim 1, wherein the step of sequentially accumulating the rated refrigerating capacities of a preset number of throttling units in the at least two throttling units until the total customized refrigerating capacity Q' is greater than or equal to the refrigerating load Q comprises:
and the at least two throttling units are sequenced according to rated refrigerating capacity and are sequentially accumulated from small to large.
4. The method of claim 1, wherein the step of deriving a refrigeration load Q comprises:
and determining the refrigeration load Q according to the outdoor environment temperature, the set temperature of the heat exchange unit and the rated refrigerating capacity of the heat exchange unit.
5. The method of claim 4, wherein the refrigeration load Q is a rated cooling capacity Q of the heat exchange unitHeat exchange unitX outer loop correction coefficient tOuter coverAnd x is used for setting the correction number t.
6. The method of controlling a throttling unit of a refrigeration system of claim 1, further comprising: and adjusting the opening degree of the throttling unit with the preset opening degree according to the superheat degree T of the heat exchange unit.
7. The method for controlling a throttling unit of a refrigeration system according to claim 6, wherein in the step of adjusting the opening degree of the throttling unit with a preset opening degree according to the superheat degree T of the heat exchange unit, the amount of change of the opening degree of the throttling unit with the preset opening degree is the same.
8. The method of claim 6, wherein the superheat T of the heat exchange unit is a difference between a temperature detection value of the refrigerant outlet pipe and a temperature detection value of the refrigerant inlet pipe.
9. The control method of a throttling unit of a refrigeration system according to any of claims 1 to 8, further comprising: and adjusting the number of the throttling units participating in the accumulation of the rated refrigerating capacity according to the superheat degree T of the heat exchange unit.
10. The method of controlling a throttling unit of a refrigeration system of claim 9, further comprising:
obtaining the superheat degree T of the heat exchange unit;
if the superheat degree T is less than a preset value A, and the duration is more than or equal to M;
the number of throttling units participating in the accumulation of the rated refrigerating capacity is reduced.
11. The method of claim 10, wherein the step of reducing the number of throttling units participating in the nominal capacity accumulation comprises:
and reducing the rated refrigerating capacity of the throttling unit participating in the rated refrigerating capacity accumulation according to the sequence from small to large.
12. The method of controlling a throttling unit of a refrigeration system of claim 9, further comprising:
obtaining the superheat degree T of the heat exchange unit;
if the superheat degree T is larger than a preset value B, and the duration is longer than or equal to N;
the number of throttling units participating in the accumulation of the rated refrigerating capacity is increased.
13. The method of claim 12, wherein the step of increasing the number of throttling units participating in the nominal capacity accumulation comprises:
and increasing the rated refrigerating capacity of the throttling unit which does not participate in the rated refrigerating capacity accumulation according to the sequence from small to large.
14. The method of controlling a throttling unit of a refrigeration system according to any one of claims 1 to 13, wherein the throttling unit is at least one of an electronic expansion valve and a pressure expansion valve.
15. The utility model provides a controlling means of refrigerating system's throttle unit, its characterized in that, refrigerating system includes heat exchange unit and at least two throttle units, at least two throttle unit parallel connection back with heat exchange unit connects, controlling means includes:
a first control unit configured to be able to acquire a refrigeration load Q of the heat exchange unit;
the second control unit is configured to accumulate rated refrigerating capacity of the throttling units in the at least two throttling units until the total customized refrigerating capacity Q' is more than or equal to the refrigerating load Q;
and the third control unit is configured to be capable of controlling the opening degree of the throttling unit participating in the accumulation of the rated refrigerating capacity to be a preset opening degree.
16. The control device of the throttling unit according to claim 14, characterized in that the third control unit is further configured to control the opening degree of the throttling unit not participating in the accumulation of the rated cooling capacity to be kept at 0.
17. The control device of the throttling unit according to claim 14, further comprising a fourth control unit configured to adjust the opening degree of the throttling unit of a preset opening degree according to the superheat degree T of the heat exchange unit.
18. The control device of a throttle unit according to any one of claims 14-16, characterized by further comprising:
a first detection unit configured to be able to detect a temperature of the refrigerant outlet pipe;
the second detection unit is configured to be capable of detecting the temperature of the refrigerant inlet pipe;
and the fifth control unit is configured to calculate the superheat degree T of the heat exchange unit according to the temperature of the refrigerant outlet pipe and the temperature of the refrigerant inlet pipe.
19. The control device of the throttling unit according to any one of claims 14 to 17, further comprising a sixth control unit configured to control to reduce the number of throttling units participating in the accumulation of the rated cooling capacity when the superheat T is less than the preset value a and the duration is greater than or equal to M.
20. The control device of the throttling unit according to claim 19, wherein the sixth control unit is further configured to control to increase the number of the throttling units participating in the accumulation of the rated refrigerating capacity when the superheat degree T is greater than a preset value B and the duration is greater than or equal to N.
21. Readable storage medium, characterized in that a method of controlling a throttling unit of a refrigeration system according to any of claims 1 to 14 is used.
22. A refrigeration system, characterized in that a method of controlling a throttle unit according to any one of claims 1-14 or a device for controlling a throttle unit according to any one of claims 15-20 is used.
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