CN111765680A - Ice making system control strategy and system - Google Patents
Ice making system control strategy and system Download PDFInfo
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- CN111765680A CN111765680A CN202010495042.2A CN202010495042A CN111765680A CN 111765680 A CN111765680 A CN 111765680A CN 202010495042 A CN202010495042 A CN 202010495042A CN 111765680 A CN111765680 A CN 111765680A
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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
- F25C—PRODUCING, WORKING OR HANDLING ICE
- F25C1/00—Producing ice
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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
- F25C—PRODUCING, WORKING OR HANDLING ICE
- F25C2500/00—Problems to be solved
- F25C2500/08—Sticking or clogging of ice
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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
- F25C—PRODUCING, WORKING OR HANDLING ICE
- F25C2600/00—Control issues
- F25C2600/04—Control means
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- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Production, Working, Storing, Or Distribution Of Ice (AREA)
Abstract
The invention discloses a control strategy and a control system of an ice making system, which are divided into a standby state, a starting state, an operating state and a stopping state, and are designed into the following steps: judging whether the system is in a standby state and meets ice making starting conditions; executing an ice making subprogram, marking the subprogram as an operating state and entering the subprogram, and entering the subprogram if ice making stopping conditions are met; judging whether ice making stop conditions are met; judging whether the blockage exists; judging whether the crystal growth promoting operation condition is met; executing a crystal promotion subprogram, and then entering the crystal promotion subprogram, and entering the crystal promotion subprogram if a blockage condition is met; executing a thawing subprogram, and then entering if ice-making stopping conditions are met; the ice-making stop sub-routine is executed, and thereafter, it is marked as a standby state and entered. The invention can effectively reduce the ice blockage phenomenon of the ice making loop in the ice making operation process, shorten the ice making time and reduce the energy consumption of equipment, thereby realizing the safe, continuous and efficient operation of the ice making system on the basis of meeting the requirement of users on cold.
Description
Technical Field
The invention relates to the technical field of ice making, in particular to a control strategy and a control system of an ice making system.
Background
The centralized central air conditioner is an indispensable part of a large-scale urban building, and with the recent year-by-year increase of the power consumption of an air conditioning system, energy conservation becomes a major concern in the air conditioning industry. By adopting the cold accumulation system, the cold accumulation is carried out at the electric power off-peak period at night, and the cold is released at the electric power on-peak period in the daytime, so that the energy consumption of the air-conditioning refrigerating unit at the electric power peak period can be reduced, on one hand, the peak load shifting of the electric power is realized, on the other hand, the whole operation cost of the air conditioner can be saved by utilizing the peak-to-valley electricity price difference, and the economic benefit is brought. The dynamic ice slurry preparation technology overcomes the defects of large occupied space, low efficiency and the like of the traditional cold accumulation system in a flowing ice mode, and becomes the mainstream development direction of the current cold accumulation technology.
The dynamic ice slurry preparation system has complex operation condition and higher automation requirement, and needs the system to realize automatic judgment, such as ice making start based on user setting, system shutdown based on fault or ice making requirement completion, and the like; meanwhile, the operation process of the system comprises working modes of blockage judgment, crystal promotion, unfreezing and the like, and different devices are required to be started according to the real-time state of the system to realize corresponding functions, so that the safe, continuous and efficient operation of the system is ensured.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an ice making system control strategy and system to improve the stability and reliability of system operation.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a control strategy of an ice making system is disclosed, wherein the operation conditions of the ice making system at least comprise a standby state, a starting state, an operation state and a shutdown state, the ice making system at least comprises a compressor, an ice making pump, a refrigerant carrying pump, a condensing fan, a crystal promotion device and a four-way valve, and the control strategy comprises the following steps:
s1: judging whether the ice making system is in a standby state and meets ice making starting conditions, if so, marking the ice making system in a running state and executing S2, otherwise, executing S1 in a circulating manner;
s2: executing an ice making subprogram, marking the ice making subprogram as an operating state and executing S3 after the ice making subprogram is executed, and marking the ice making subprogram as a stop state and executing S8 if an ice making stop condition is met during the execution of the ice making subprogram;
s3: judging whether the ice-making system meets ice-making stopping conditions or not, if so, marking the ice-making system in a stop state and executing S8, and if not, executing S4;
s4: judging whether the ice making system is blocked, if not, executing S5, and if so, executing S7;
s5: judging whether the ice-making system meets the crystal promoting operation condition, if so, executing S6, and if not, executing S3;
s6: executing a crystal promotion sub-program, executing S3 after the crystal promotion sub-program is executed, and executing S7 if an ice making system is blocked during the execution of the crystal promotion sub-program;
s7: executing a thawing subprogram, executing S3 after the thawing subprogram is executed, and marking the ice-making system in a shutdown state and executing S8 if the ice-making system meets ice-making stop conditions during the execution of the thawing subprogram;
s8: and executing the ice making stopping sub-routine, marking the ice making stopping sub-routine as a standby state after the ice making stopping sub-routine is executed, and returning to the step S1.
The ice making system control strategy as described above, further, the standby state is a state where all devices of the ice making system are powered on and waiting for a trigger signal; the starting state is the process that all the equipment of the ice-making system are started according to a set sequence, and the ice-making starting subprogram comprises the sequential starting of a refrigerant-carrying pump, a condensing fan, an ice-making pump and a compressor according to the set sequence and time intervals.
The ice making system control strategy is characterized in that the operation state is a process of performing ice making operation by the ice making system, and the shutdown state is a process of closing each device of the ice making system according to a set sequence, wherein the operation state includes performing blockage judgment, performing crystal promotion operation condition judgment, executing a crystal promotion subroutine, and executing a thawing subroutine; the ice-making stopping subprogram is that the compressor, the condensing fan, the refrigerant carrying pump, the ice-making pump, the crystal promotion device and the four-way valve are closed in sequence and time intervals.
The ice making system control strategy is characterized in that the ice making starting condition is that a trigger signal for starting ice making is received when the current ice making quantity of the ice making system is lower than a set value.
The ice making system control strategy as described above, further, the method for judging whether the ice making system is blocked is: judging through the flow and the pressure of an outlet of a refrigerating pump of the ice making system, wherein if the flow and the pressure are greater than set values, the ice storage system is not blocked; if the flow rate or the pressure is smaller than the set value, the ice making system is blocked at the moment.
The ice making system control strategy is characterized in that the crystal promoting operation condition is that the temperature of supercooled water in a loop of an ice making pump of the ice making system after being exchanged by a heat exchange plate is lower than a certain set value TsetAnd set the value TsetIn a set interval Tset∈(Tmin,Tmax)。
In the ice making system control strategy as described above, the ice making stop condition is that a trigger signal for stopping ice making is obtained or the number of times of execution of the thawing subroutine reaches a set upper limit value.
According to the ice making system control strategy, further, the crystal promotion subroutine is that the crystal promotion device is started and operated according to a set time length under the condition that the crystal promotion operation condition is met.
According to the ice making system control strategy, further, the thawing subprogram is that the ice making pump is firstly closed, then the four-way valve is opened and operates according to a set time length, and then the four-way valve is closed and the ice making pump is restarted.
An ice making system utilizing an ice making system control strategy as described in any of the above, said system comprising a compressor, an ice making pump, a coolant pump, an evaporator plate, a condensing fan, a crystal actuator, and a four-way valve;
a high-pressure outlet of the compressor is connected with an inlet of the four-way valve, and a low-pressure inlet of the compressor is connected with an outlet of the four-way valve, so that gas compression is realized;
one end of the condensing fan is connected with one end of the evaporating plate through an expansion valve, the other end of the condensing fan is connected to a normally open port of the four-way valve, and the other end of the evaporating plate is connected to a normally closed port of the four-way valve;
the secondary refrigerant pump is connected with the evaporation plate and the supercooling plate through pipelines to form a secondary refrigerant loop so as to realize the flow of the secondary refrigerant;
the ice making pump is connected with the crystal promotion device and the supercooling plate through pipelines to form an ice making loop so as to realize the flow of ice slurry and water.
Compared with the prior art, the invention has the beneficial effects that: aiming at various operation conditions of the ice making system, the ice making system is divided into a standby state, a starting state, an operation state and a stop state, an automatic operation control strategy of the ice making system is designed by reasonably judging conditions and skipping flows and combining equipment which is correspondingly started in different working modes and different functions, the ice blocking phenomenon of an ice making loop in the ice making operation process can be effectively reduced, the ice making time is shortened, and the energy consumption of the equipment is reduced, so that the safe, continuous and efficient operation of the ice making system is realized on the basis of meeting the user cooling requirement.
Drawings
FIG. 1 is a flow chart of an ice-making system control strategy of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and detailed description.
Example (b):
as shown in fig. 1, an ice making system control strategy includes the steps of:
a. if the ice-making system is in a standby state and meets ice-making starting conditions, marking the ice-making system in a starting state and entering the step b, otherwise, circularly executing the step a; wherein the standby state is a state in which all devices of the ice making system are powered on and wait for a trigger signal; the ice making starting condition is that the ice making system receives a triggering signal for starting ice making when the current ice making quantity of the ice making system is lower than a set value; the starting state is a process that all the devices of the ice making system are started according to a set sequence.
b. Executing the ice making subprogram, marking the running state after the ice making subprogram is executed, and entering the step c; if the ice making stop condition is met, marking the ice making stop condition as a stop state and entering the step h; the ice-making starting subprogram comprises that a refrigerant-carrying pump, a condensing fan, an ice-making pump and a compressor are started in sequence according to a set sequence and time intervals; the ice-making stopping condition is that a trigger signal for stopping ice making is obtained or the execution frequency of the thawing subprogram reaches a set upper limit value; the operation state is a process of ice making operation of the ice making system; the shutdown state is a process in which the respective devices of the ice making system are shut down in a set order.
c. Judging whether the ice making system meets ice making stopping conditions or not, if so, marking the ice making system in a stop state and entering the step h, otherwise, entering the step d; the ice-making stopping condition is that a trigger signal for stopping ice making is obtained or the execution frequency of the thawing subprogram reaches a set upper limit value; the shutdown state is a process in which the respective devices of the ice making system are shut down in a set order.
d. Judging whether the ice making system is blocked, if not, entering the step e, otherwise, entering the step g; the method for judging whether the ice making system is blocked comprises the following steps: judging through the flow and the pressure of an outlet of a refrigerating pump of the ice making system, wherein if the flow and the pressure are greater than set values, the ice storage system is not blocked; if the flow rate or the pressure is smaller than the set value, the ice making system is blocked at the moment.
e. Judging whether the ice making system meets the crystal promoting operation condition, if so, entering the step f, otherwise, entering the step c; the crystal promoting operation condition is that the temperature of supercooled water in a loop of an ice making pump of the ice making system after being exchanged by a heat exchange plate is lower than a certain set value TsetAnd set the value TsetIn a set intervalTset∈(Tmin,Tmax)。
f. C, executing a crystal promotion subprogram, and entering the step c after the crystal promotion subprogram is executed; if the ice making system is judged to be blocked in the period, the step g is carried out; the crystal promotion subprogram is that the crystal promotion device is started and operated according to a set time length under the condition of meeting the crystal promotion operation condition; the method for judging whether the ice making system is blocked comprises the following steps: judging through the flow and the pressure of an outlet of a refrigerating pump of the ice making system, wherein if the flow and the pressure are greater than set values, the ice storage system is not blocked; if the flow rate or the pressure is smaller than the set value, the ice making system is blocked at the moment.
g. C, executing a thawing subprogram, and entering the step c after the thawing subprogram is executed; if the ice making system meets the ice making stopping condition, marking the ice making system in a stop state and entering the step h; the defrosting subprogram is that the ice making pump is firstly closed, then the four-way valve is opened and operates according to a set time length, and then the four-way valve is closed and the ice making pump is restarted; the ice-making stopping condition is that a trigger signal for stopping ice making is obtained or the execution frequency of the thawing subprogram reaches a set upper limit value; the shutdown state is a process in which the respective devices of the ice making system are shut down in a set order.
h. And executing the ice making stopping sub-routine, marking the ice making stopping sub-routine as a standby state after the ice making stopping sub-routine is executed, and entering the step a. The ice-making stopping subprogram is that the compressor, the condensing fan, the refrigerant-carrying pump, the ice-making pump, the crystal-promoting device and the four-way valve are sequentially closed in a set sequence and time interval; the standby state is a state in which all devices of the ice making system are powered on and wait for a trigger signal.
In this embodiment, the ice making system control strategy may be implemented in a conventional ice making machine, the conventional ice making machine generally includes a compressor, an ice making pump, a refrigerant pump, a condensing fan, a crystal actuator, and a four-way valve, and an ice making system provided by another aspect of the present invention may also be used, where the method includes the following operation processes: switching on a power supply of the ice making system, and powering on all equipment and keeping the equipment in a standby state; when the system is in a complete ice melting state after standing for a long enough time, an ice making automatic operation control switch is turned on to obtain a trigger signal for starting ice making; at the moment, the mark is in a starting state and the step b is executed;
setting the interval time of starting the equipment to be 30 seconds, and starting a refrigerant-carrying pump, a condensing fan, an ice-making pump and a compressor in sequence by an ice-making system; then it is marked as running and step c is performed.
And setting the highest execution frequency of the thawing subprogram as 1 time, setting the triggering signal for stopping ice making to be from overload of a compressor, fault of an ice making pump, fault of a coolant pump, fault of a condensing fan or closing of an automatic ice making operation control switch, and circularly operating the control flow between the step d and the step g when the conditions are not met.
The flow value of the outlet of the refrigerating pump is set to be 4m3Monitoring the flow of the outlet of the refrigerating pump in real time; if the flow rate is greater than or equal to 4m3E, judging that the system is not blocked, and entering the step e; if the flow rate is less than 4m3And h, judging that the system is blocked, and entering the step g.
If the current flow is monitored to be 4.5m3And h, judging that the system is not blocked, and entering the step e. Setting TsetAt-0.4 ℃ and TminAt a temperature of-1.6 ℃ and TmaxThe temperature is 1 ℃, the crystal growth promoting time is set to be 500 seconds, the temperature of supercooled water in a loop of the ice making pump after being exchanged by the heat exchange plate is monitored, and if the temperature is-0.5 ℃, the crystal growth promoting device is started to promote crystal growth. And c, after the crystal promotion subprogram is executed, re-entering the step c for circulating operation.
If the current flow is monitored to be 3.5m3And h, judging that the system is blocked, and entering the step g. The thawing duration was set to 400 seconds. At the moment, firstly, the ice making pump is closed, then, the four-way valve is opened, and the ice is thawed for 400 seconds; the four-way valve is then closed and the ice-making pump is turned on again.
Since the maximum number of times of execution of the thawing subroutine is set to 1, the ice-making stop condition is satisfied at this time. The time interval of closing the equipment is set to be 10 seconds, and the compressor, the condensing fan, the refrigerant carrying pump and the ice making pump are sequentially closed by the ice making system. After the ice making stopping sub-program is executed, the ice making system is marked as a standby state, the ice making automatic operation control switch is reset to be in an off state, and the step a is re-entered to wait for the next start operation.
In addition, the invention also provides an ice making system which operates by utilizing the ice making system control strategy, wherein the system comprises a compressor, an ice making pump, a refrigerant carrying pump, an evaporation plate, a condensing fan, a crystal promotion device and a four-way valve; the high-pressure outlet of the compressor is connected with the inlet of the four-way valve, and the low-pressure inlet of the compressor is connected with the outlet of the four-way valve, so that gas compression is realized; one end of a condensing fan and one end of an evaporating plate are connected through an expansion valve, the other end of the condensing fan is connected to a normally open port of a four-way valve, the other end of the evaporating plate is connected to a normally closed port of the four-way valve, wherein the on-off state of the four-way valve is used for converting the normally open port and the normally closed port to change the flowing direction of gas to realize the switching of working conditions, the four-way valve is a refrigerating working condition when being powered off, and is a heating working condition when being powered on; the secondary refrigerant pump is connected with the evaporation plate and the supercooling plate through pipelines to form a secondary refrigerant loop so as to realize the flow of the secondary refrigerant; the ice making pump is connected with the crystal promoting device and the supercooling plate through pipelines to form an ice making loop so as to realize the flow of ice slurry and water, the condensing fan is used for gas cooling, the evaporating plate is used for gas evaporation, and the crystal promoting device is used for generating ice crystals.
The invention aims at various operation conditions of the ice making system, divides the ice making system into a standby state, a starting state, an operation state and a stopping state, designs an automatic operation control strategy of the ice making system by reasonably judging conditions and skipping flows and combining equipment which is correspondingly started in different working modes and different functions, can effectively reduce the ice blockage phenomenon of an ice making loop in the ice making operation process, shortens the ice making time and reduces the energy consumption of the equipment, thereby realizing the safe, continuous and efficient operation of the ice making system on the basis of meeting the requirements of users on cooling.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.
Claims (10)
1. The ice making system control strategy is characterized in that the operation conditions of the ice making system at least comprise a standby state, a starting state, an operation state and a stopping state, the ice making system at least comprises a compressor, an ice making pump, a refrigerant carrying pump, a condensing fan, a crystal promotion device and a four-way valve, and the control strategy comprises the following steps:
s1: judging whether the ice making system is in a standby state and meets ice making starting conditions, if so, marking the ice making system in a running state and executing S2, otherwise, executing S1 in a circulating manner;
s2: executing an ice making subprogram, marking the ice making subprogram as an operating state and executing S3 after the ice making subprogram is executed, and marking the ice making subprogram as a stop state and executing S8 if an ice making stop condition is met during the execution of the ice making subprogram;
s3: judging whether the ice-making system meets ice-making stopping conditions or not, if so, marking the ice-making system in a stop state and executing S8, and if not, executing S4;
s4: judging whether the ice making system is blocked, if not, executing S5, and if so, executing S7;
s5: judging whether the ice-making system meets the crystal promoting operation condition, if so, executing S6, and if not, executing S3;
s6: executing a crystal promotion sub-program, executing S3 after the crystal promotion sub-program is executed, and executing S7 if an ice making system is blocked during the execution of the crystal promotion sub-program;
s7: executing a thawing subprogram, executing S3 after the thawing subprogram is executed, and marking the ice-making system in a shutdown state and executing S8 if the ice-making system meets ice-making stop conditions during the execution of the thawing subprogram;
s8: and executing the ice making stopping sub-routine, marking the ice making stopping sub-routine as a standby state after the ice making stopping sub-routine is executed, and returning to the step S1.
2. An ice making system control strategy as claimed in claim 1 wherein the standby state is a state in which all devices of the ice making system are powered on and waiting for a trigger signal; the starting state is the process that all the equipment of the ice-making system are started according to a set sequence, and the ice-making starting subprogram comprises the sequential starting of a refrigerant-carrying pump, a condensing fan, an ice-making pump and a compressor according to the set sequence and time intervals.
3. The ice making system control strategy according to claim 1, wherein the operation state is a process of performing ice making operation of the ice making system, and the shutdown state is a process of shutting down each device of the ice making system in a set order, wherein the operation state includes performing a blockage judgment, performing a crystal promotion operation condition judgment, performing a crystal promotion subroutine, and performing a thawing subroutine; the ice-making stopping subprogram is that the compressor, the condensing fan, the refrigerant carrying pump, the ice-making pump, the crystal promotion device and the four-way valve are closed in sequence and time intervals.
4. An ice making system control strategy as claimed in claim 1, wherein the ice making initiation condition is the acceptance of an ice making initiation trigger signal when the current ice making quantity of the ice making system is below a set value.
5. The ice making system control strategy of claim 1, wherein the ice making system is blocked by: judging through the flow and the pressure of an outlet of a refrigerating pump of the ice making system, wherein if the flow and the pressure are greater than set values, the ice storage system is not blocked; if the flow rate or the pressure is smaller than the set value, the ice making system is blocked at the moment.
6. The ice-making system control strategy of claim 1, wherein the crystallization promoting operation condition is that the temperature of supercooled water in a loop of an ice-making pump of the ice-making system after being exchanged by the heat exchange plate is lower than a certain set value TsetAnd set the value TsetIn a set interval Tset∈(Tmin,Tmax)。
7. The ice making system control strategy according to claim 1, wherein the ice making stop condition is that a trigger signal for ice making stop is obtained or that the number of times of execution of the thawing subroutine reaches a set upper limit value.
8. The ice making system control strategy of claim 1, wherein the crystal promotion subroutine is a crystal promoter that is turned on and operated according to a set time period when the crystal promotion operation condition is met.
9. The ice making system control strategy of claim 1, wherein the defrost subroutine is to turn off the ice making pump first, then turn on the four-way valve and run the four-way valve for a set length of time, then turn off the four-way valve and turn on the ice making pump again.
10. An ice making system utilizing an ice making system control strategy as claimed in any one of claims 1 to 9, wherein said system comprises a compressor, an ice making pump, a coolant pump, an evaporator plate, a condensing fan, a crystal growth promoter, and a four-way valve;
a high-pressure outlet of the compressor is connected with an inlet of the four-way valve, and a low-pressure inlet of the compressor is connected with an outlet of the four-way valve, so that gas compression is realized;
one end of the condensing fan is connected with one end of the evaporating plate through an expansion valve, the other end of the condensing fan is connected to a normally open port of the four-way valve, and the other end of the evaporating plate is connected to a normally closed port of the four-way valve;
the secondary refrigerant pump is connected with the evaporation plate and the supercooling plate through pipelines to form a secondary refrigerant loop so as to realize the flow of the secondary refrigerant;
the ice making pump is connected with the crystal promotion device and the supercooling plate through pipelines to form an ice making loop so as to realize the flow of ice slurry and water.
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| CN202010495042.2A CN111765680A (en) | 2020-06-03 | 2020-06-03 | Ice making system control strategy and system |
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| CN114963649A (en) * | 2022-06-14 | 2022-08-30 | 四川虹美智能科技有限公司 | Method for intelligently making ice series food materials by using refrigerator |
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Application publication date: 20201013 |